diff --git a/ts/dist_old/index.html b/ts/dist_old/index.html
deleted file mode 100644
index 69c5157..0000000
--- a/ts/dist_old/index.html
+++ /dev/null
@@ -1,1042 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-
-<head>
-  <meta charset="UTF-8" />
-  <meta name="viewport" content="width=device-width,initial-scale=1.0" />
-  <title>MonoDisplay Editor</title>
-  <style>
-    *,
-    *::before,
-    *::after {
-      box-sizing: border-box;
-      margin: 0;
-      padding: 0
-    }
-
-    body {
-      background: #111;
-      color: #ccc;
-      font-family: monospace;
-      height: 100vh;
-      display: flex;
-      flex-direction: column;
-      overflow: hidden;
-      font-size: 12px
-    }
-
-    #topbar {
-      height: 36px;
-      background: #1a1a1a;
-      border-bottom: 1px solid #2a2a2a;
-      display: flex;
-      align-items: center;
-      gap: 8px;
-      padding: 0 12px;
-      flex-shrink: 0
-    }
-
-    #topbar .app-name {
-      color: #555;
-      font-size: 11px;
-      letter-spacing: .12em;
-      text-transform: uppercase;
-      margin-right: 4px
-    }
-
-    .tb-btn {
-      background: #161616;
-      color: #888;
-      border: 1px solid #2d2d2d;
-      border-radius: 3px;
-      padding: 3px 10px;
-      font-family: monospace;
-      font-size: 11px;
-      cursor: pointer;
-      display: flex;
-      align-items: center;
-      gap: 5px;
-      white-space: nowrap
-    }
-
-    .tb-btn:hover {
-      background: #222;
-      color: #bbb;
-      border-color: #444
-    }
-
-    .tb-btn svg {
-      width: 13px;
-      height: 13px;
-      stroke: currentColor;
-      fill: none;
-      stroke-width: 1.8;
-      stroke-linecap: round;
-      stroke-linejoin: round;
-      flex-shrink: 0
-    }
-
-    #file-input {
-      display: none
-    }
-
-    #filename {
-      color: #3a3a3a;
-      font-size: 11px;
-      margin-left: 2px;
-      max-width: 200px;
-      overflow: hidden;
-      text-overflow: ellipsis;
-      white-space: nowrap
-    }
-
-    .tb-sep {
-      width: 1px;
-      height: 18px;
-      background: #2a2a2a
-    }
-
-    .dirty {
-      color: #886622 !important
-    }
-
-    #main {
-      flex: 1;
-      display: flex;
-      min-height: 0
-    }
-
-    #left {
-      width: 48%;
-      border-right: 1px solid #1e1e1e;
-      display: flex;
-      flex-direction: column;
-      padding: 14px;
-      gap: 10px;
-      overflow-y: auto;
-      flex-shrink: 0
-    }
-
-    #display-box {
-      width: 100%;
-      aspect-ratio: 2/1;
-      background: #000;
-      border: 1px solid #2a2a2a;
-      border-radius: 3px;
-      overflow: hidden
-    }
-
-    #canvas_root {
-      width: 100%;
-      height: 100%;
-      display: block;
-      image-rendering: pixelated;
-      image-rendering: crisp-edges
-    }
-
-    .pv-label {
-      font-size: 10px;
-      color: #333;
-      letter-spacing: .1em;
-      text-transform: uppercase
-    }
-
-    #demo-btns {
-      display: flex;
-      flex-wrap: wrap;
-      gap: 5px;
-      margin-top: 6px
-    }
-
-    #sec-meta {
-      background: #141414;
-      border: 1px solid #1e1e1e;
-      border-radius: 3px;
-      padding: 8px 10px;
-      display: flex;
-      flex-direction: column;
-      gap: 6px
-    }
-
-    .meta-row {
-      display: flex;
-      align-items: center;
-      gap: 8px;
-      font-size: 11px
-    }
-
-    .meta-row label {
-      color: #444;
-      min-width: 90px
-    }
-
-    .meta-val {
-      color: #666
-    }
-
-    .green {
-      color: #33ff66
-    }
-
-    .flag-check {
-      display: flex;
-      align-items: center;
-      gap: 5px;
-      font-size: 11px;
-      color: #555;
-      cursor: pointer
-    }
-
-    .flag-check input {
-      accent-color: #33ff66;
-      cursor: pointer
-    }
-
-    #right {
-      flex: 1;
-      display: flex;
-      flex-direction: column;
-      min-height: 0;
-      overflow: hidden
-    }
-
-    #right-hdr {
-      height: 36px;
-      background: #141414;
-      border-bottom: 1px solid #1e1e1e;
-      display: flex;
-      align-items: center;
-      padding: 0 10px;
-      gap: 6px;
-      flex-shrink: 0
-    }
-
-    #right-hdr .rh-title {
-      flex: 1;
-      color: #444;
-      font-size: 11px;
-      letter-spacing: .08em;
-      text-transform: uppercase
-    }
-
-    #sections-wrap {
-      flex: 1;
-      overflow-y: auto;
-      padding: 8px
-    }
-
-    .empty-state {
-      color: #2e2e2e;
-      font-size: 11px;
-      padding: 28px 16px;
-      text-align: center;
-      line-height: 2
-    }
-
-    /* section card */
-    .sec-card {
-      border: 1px solid #222;
-      border-radius: 3px;
-      margin-bottom: 5px;
-      overflow: hidden
-    }
-
-    .sec-card.active {
-      border-color: #2b3d2b
-    }
-
-    .sec-hdr {
-      display: flex;
-      align-items: center;
-      gap: 7px;
-      padding: 6px 8px;
-      cursor: pointer;
-      user-select: none;
-      background: #161616;
-      position: relative
-    }
-
-    .sec-hdr:hover {
-      background: #1b1b1b
-    }
-
-    .sec-card.active .sec-hdr {
-      background: #182018
-    }
-
-    .sec-arrow {
-      color: #333;
-      font-size: 13px;
-      line-height: 1;
-      transition: transform .12s;
-      flex-shrink: 0
-    }
-
-    .sec-card.open .sec-arrow {
-      transform: rotate(90deg)
-    }
-
-    .sec-label {
-      flex: 1;
-      color: #777;
-      font-size: 11px
-    }
-
-    .sec-badge {
-      font-size: 10px;
-      color: #33ff66;
-      border: 1px solid #2b3d2b;
-      background: #141e14;
-      border-radius: 2px;
-      padding: 1px 6px;
-      flex-shrink: 0
-    }
-
-    /* red ×  — section & element */
-    .x-btn {
-      background: none;
-      border: none;
-      color: #2a2a2a;
-      cursor: pointer;
-      font-size: 15px;
-      line-height: 1;
-      padding: 2px 5px;
-      border-radius: 2px;
-      flex-shrink: 0;
-      transition: color .1s, background .1s
-    }
-
-    .x-btn:hover {
-      color: #ff4444;
-      background: #1e1010
-    }
-
-    /* element */
-    .el-list {
-      background: #0f0f0f;
-      border-top: 1px solid #1c1c1c;
-      padding: 6px
-    }
-
-    .el-item {
-      border: 1px solid #1e1e1e;
-      border-radius: 3px;
-      background: #141414;
-      margin-bottom: 4px;
-      overflow: hidden
-    }
-
-    .el-item.active {
-      border-color: #33ff66
-    }
-
-    .el-item-hdr {
-      display: flex;
-      align-items: center;
-      gap: 6px;
-      padding: 5px 8px;
-      cursor: pointer
-    }
-
-    .el-item-hdr:hover {
-      background: #1a1a1a
-    }
-
-    .el-type {
-      font-size: 10px;
-      color: #666;
-      border: 1px solid #252525;
-      border-radius: 2px;
-      padding: 1px 6px;
-      flex-shrink: 0
-    }
-
-    .el-item.active .el-type {
-      color: #33ff66;
-      border-color: #2b3d2b
-    }
-
-    .el-name {
-      flex: 1;
-      color: #555;
-      font-size: 11px;
-      overflow: hidden;
-      text-overflow: ellipsis;
-      white-space: nowrap;
-      max-width: 120px
-    }
-
-    .el-fields {
-      padding: 6px 8px 8px;
-      border-top: 1px solid #1a1a1a;
-      display: flex;
-      flex-direction: column;
-      gap: 5px
-    }
-
-    .fields-grid {
-      display: grid;
-      grid-template-columns: 1fr 1fr;
-      gap: 4px 10px
-    }
-
-    .field {
-      display: flex;
-      flex-direction: column;
-      gap: 2px
-    }
-
-    .field.full {
-      grid-column: 1/-1
-    }
-
-    .field>label {
-      font-size: 10px;
-      color: #444
-    }
-
-    .field input[type=text],
-    .field input[type=number],
-    .field select,
-    .field textarea {
-      background: #0a0a0a;
-      color: #999;
-      border: 1px solid #222;
-      border-radius: 2px;
-      padding: 3px 6px;
-      font-family: monospace;
-      font-size: 11px;
-      width: 100%;
-      outline: none
-    }
-
-    .field input:focus,
-    .field select:focus,
-    .field textarea:focus {
-      border-color: #33ff66;
-      color: #ccc
-    }
-
-    .field textarea {
-      resize: vertical;
-      min-height: 44px;
-      line-height: 1.4
-    }
-
-    .field select option {
-      background: #1a1a1a;
-      color: #aaa
-    }
-
-    .flags-row {
-      display: flex;
-      flex-wrap: wrap;
-      gap: 10px;
-      padding: 2px 0
-    }
-
-    .add-el {
-      background: transparent;
-      color: #333;
-      border: 1px dashed #222;
-      border-radius: 3px;
-      padding: 5px 8px;
-      font-family: monospace;
-      font-size: 11px;
-      cursor: pointer;
-      width: 100%;
-      text-align: center;
-      margin-top: 2px
-    }
-
-    .add-el:hover {
-      color: #888;
-      border-color: #444
-    }
-
-    /* confirm dialog */
-    #confirm-overlay {
-      display: none;
-      position: fixed;
-      inset: 0;
-      background: rgba(0, 0, 0, .6);
-      z-index: 100;
-      align-items: center;
-      justify-content: center
-    }
-
-    #confirm-overlay.show {
-      display: flex
-    }
-
-    #confirm-box {
-      background: #1a1a1a;
-      border: 1px solid #333;
-      border-radius: 4px;
-      padding: 20px 24px;
-      max-width: 340px;
-      width: 90%;
-      display: flex;
-      flex-direction: column;
-      gap: 14px
-    }
-
-    #confirm-msg {
-      color: #aaa;
-      font-size: 12px;
-      line-height: 1.6
-    }
-
-    #confirm-btns {
-      display: flex;
-      gap: 8px;
-      justify-content: flex-end
-    }
-
-    .cb {
-      background: #161616;
-      color: #888;
-      border: 1px solid #2d2d2d;
-      border-radius: 3px;
-      padding: 4px 14px;
-      font-family: monospace;
-      font-size: 11px;
-      cursor: pointer
-    }
-
-    .cb:hover {
-      background: #222;
-      color: #bbb
-    }
-
-    .cb.primary {
-      border-color: #2b3d2b;
-      color: #33ff66
-    }
-
-    .cb.primary:hover {
-      background: #182018
-    }
-  </style>
-</head>
-
-<body>
-
-  <div id="topbar">
-    <span class="app-name">MonoDisplay</span>
-    <div class="tb-sep"></div>
-    <button class="tb-btn" onclick="document.getElementById('file-input').click()">
-      <svg viewBox="0 0 24 24">
-        <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" />
-        <polyline points="17 8 12 3 7 8" />
-        <line x1="12" y1="3" x2="12" y2="15" />
-      </svg>
-      Load .bin
-    </button>
-    <input type="file" id="file-input" accept=".bin" onchange="loadBin(this)" />
-    <button class="tb-btn" onclick="exportBin()">
-      <svg viewBox="0 0 24 24">
-        <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" />
-        <polyline points="7 10 12 15 17 10" />
-        <line x1="12" y1="15" x2="12" y2="3" />
-      </svg>
-      Export .bin
-    </button>
-    <div class="tb-sep"></div>
-    <button class="tb-btn" onclick="addSection()">
-      <svg viewBox="0 0 24 24">
-        <line x1="12" y1="5" x2="12" y2="19" />
-        <line x1="5" y1="12" x2="19" y2="12" />
-      </svg>
-      Add section
-    </button>
-    <span id="filename">untitled</span>
-  </div>
-
-  <div id="main">
-    <div id="left">
-      <span class="pv-label">preview · 120 × 60</span>
-      <div id="display-box">
-        <canvas id="canvas_root" width="120" height="60"></canvas>
-      </div>
-      <span class="pv-label">demos</span>
-      <div id="demo-btns"></div>
-      <div id="sec-meta">
-        <div class="meta-row">
-          <label>Selected section</label>
-          <span class="meta-val green" id="meta-name">—</span>
-        </div>
-        <div class="meta-row">
-          <label>Elements</label>
-          <span class="meta-val" id="meta-count">—</span>
-        </div>
-        <div class="meta-row">
-          <label>Section flags</label>
-          <label class="flag-check">
-            <input type="checkbox" id="flag-drawFront" onchange="setSectionFlag('drawFront',this.checked)" />
-            drawFront
-          </label>
-          <label class="flag-check" style="margin-left:8px">
-            <input type="checkbox" id="flag-clearBuffer" onchange="setSectionFlag('clearBuffer',this.checked)" />
-            clearBuffer
-          </label>
-        </div>
-      </div>
-    </div>
-
-    <div id="right">
-      <div id="right-hdr">
-        <span class="rh-title">sections</span>
-      </div>
-      <div id="sections-wrap">
-        <div class="empty-state">No sections yet.<br />Use <b>Add section</b> to get started.</div>
-      </div>
-    </div>
-  </div>
-
-  <!-- confirm dialog -->
-  <div id="confirm-overlay">
-    <div id="confirm-box">
-      <div id="confirm-msg"></div>
-      <div id="confirm-btns"></div>
-    </div>
-  </div>
-
-  <script src="./public/mono-display.js"></script>
-  <script>
-    const W = 120, H = 60;
-    let sections = [];
-    let activeSec = null, activeEl = null;
-    let secCounter = 0, elCounter = 0;
-    let currentFilename = 'untitled';
-    let isDirty = false;
-
-    // ─── Element type definitions ────────────────────────────────────────────────
-    const EL_TYPES = ['Image2D', 'Animation', 'ClippedText', 'HScrollText', 'CurrentTime'];
-    const EL_FIELDS = {
-      Image2D: [
-        { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 0 },
-        { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: H },
-      ],
-      Animation: [
-        { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 0 },
-        { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: H },
-        { k: 'updateInterval', l: 'Update interval', t: 'number', d: 12 },
-      ],
-      ClippedText: [
-        { k: 'text', l: 'Text', t: 'text', d: 'Hello, World!', full: true },
-        { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 32 },
-        { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: 16 },
-      ],
-      HScrollText: [
-        { k: 'text', l: 'Text', t: 'text', d: 'Scrolling text — ', full: true },
-        { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 32 },
-        { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: 16 },
-        { k: 'scrollSpeed', l: 'Scroll speed', t: 'number', d: 50 },
-      ],
-      CurrentTime: [
-        { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 8 },
-        { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: 16 },
-        { k: 'utcOffsetMinutes', l: 'UTC offset (min)', t: 'number', d: 0 },
-      ],
-    };
-    const EL_FLAGS = {
-      Image2D: [], Animation: [], ClippedText: [],
-      HScrollText: [{ k: 'endless', l: 'Endless' }, { k: 'invertDirection', l: 'Invert direction' }],
-      CurrentTime: [{ k: 'clock12h', l: '12h mode' }, { k: 'showHours', l: 'Show hours' }, { k: 'showSeconds', l: 'Show seconds' }],
-    };
-
-    // ─── Confirm dialog ───────────────────────────────────────────────────────────
-    function confirm(msg, buttons) {
-      // buttons: [{label,primary,action}]
-      return new Promise(resolve => {
-        const overlay = document.getElementById('confirm-overlay');
-        document.getElementById('confirm-msg').textContent = msg;
-        const btns = document.getElementById('confirm-btns');
-        btns.innerHTML = '';
-        buttons.forEach(b => {
-          const el = document.createElement('button');
-          el.className = 'cb' + (b.primary ? ' primary' : '');
-          el.textContent = b.label;
-          el.onclick = () => { overlay.classList.remove('show'); resolve(b.action); };
-          btns.appendChild(el);
-        });
-        overlay.classList.add('show');
-      });
-    }
-
-    // ─── Dirty tracking ───────────────────────────────────────────────────────────
-    function markDirty() {
-      isDirty = true;
-      document.getElementById('filename').classList.add('dirty');
-    }
-    function markClean() {
-      isDirty = false;
-      document.getElementById('filename').classList.remove('dirty');
-    }
-    async function guardDirty() {
-      if (!isDirty || !sections.length) return true;
-      const action = await confirm(
-        'You have unsaved changes. Loading a demo will replace the current editor state.',
-        [{ label: 'Cancel', action: false }, { label: 'Load anyway', primary: true, action: true }]
-      );
-      return action;
-    }
-
-    // ─── Helpers ─────────────────────────────────────────────────────────────────
-    function newSec() {
-      secCounter++;
-      return {
-        id: 's' + secCounter, name: 'Section ' + secCounter, open: true,
-        flags: { drawFront: true, clearBuffer: true }, elements: []
-      };
-    }
-    function newEl(type) {
-      elCounter++;
-      const fields = {};
-      (EL_FIELDS[type] || []).forEach(f => fields[f.k] = f.d);
-      const flags = {};
-      (EL_FLAGS[type] || []).forEach(f => flags[f.k] = false);
-      return { id: 'e' + elCounter, type, fields, flags };
-    }
-    function getSec(id) { return sections.find(s => s.id === id) }
-    function getEl(secId, elId) { const s = getSec(secId); return s && s.elements.find(e => e.id === elId) }
-
-    // ─── Mutations ────────────────────────────────────────────────────────────────
-    function addSection() {
-      const s = newSec(); sections.push(s);
-      activeSec = s.id; activeEl = null;
-      markDirty(); render(); triggerPreview();
-    }
-    function removeSection(id) {
-      sections = sections.filter(s => s.id !== id);
-      if (activeSec === id) { activeSec = sections.length ? sections[sections.length - 1].id : null; activeEl = null; }
-      markDirty(); render(); triggerPreview();
-    }
-    function toggleSection(id) {
-      const s = getSec(id); if (!s) return;
-      s.open = !s.open; activeSec = id; render(); updateMeta();
-    }
-    function setSectionFlag(flag, val) {
-      if (!activeSec) return;
-      const s = getSec(activeSec); if (!s) return;
-      s.flags[flag] = val; markDirty(); triggerPreview();
-    }
-    function addElement(secId) {
-      const s = getSec(secId); if (!s) return;
-      const el = newEl(EL_TYPES[0]); s.elements.push(el);
-      activeSec = secId; activeEl = { secId, elId: el.id };
-      markDirty(); render(); triggerPreview();
-    }
-    function removeElement(secId, elId) {
-      const s = getSec(secId); if (!s) return;
-      s.elements = s.elements.filter(e => e.id !== elId);
-      if (activeEl && activeEl.secId === secId && activeEl.elId === elId) activeEl = null;
-      markDirty(); render(); triggerPreview();
-    }
-    function selectElement(secId, elId) {
-      activeSec = secId;
-      activeEl = activeEl && activeEl.secId === secId && activeEl.elId === elId ? null : { secId, elId };
-      render();
-    }
-    function changeElType(secId, elId, type) {
-      const el = getEl(secId, elId); if (!el) return;
-      const fresh = newEl(type);
-      el.type = type; el.fields = fresh.fields; el.flags = fresh.flags;
-      markDirty(); render(); triggerPreview();
-    }
-    function setElField(secId, elId, key, val) {
-      const el = getEl(secId, elId); if (!el) return;
-      el.fields[key] = val; markDirty(); triggerPreview();
-    }
-    function setElFlag(secId, elId, key, val) {
-      const el = getEl(secId, elId); if (!el) return;
-      el.flags[key] = val; markDirty(); triggerPreview();
-    }
-
-    // ─── Load demo into editor state ─────────────────────────────────────────────
-    const DEMO_DEFS = [
-      {
-        label: 'Checkerboard', build() {
-          const s = newSec(); s.name = 'Checkerboard';
-          const el = newEl('Image2D');
-          s.elements.push(el);
-          s.flags = { drawFront: false, clearBuffer: false };
-          return [s];
-        }
-      },
-      {
-        label: 'Blink', build() {
-          const s = newSec(); s.name = 'Blink'; s.flags = { drawFront: true, clearBuffer: true };
-          const el = newEl('Animation'); el.fields.updateInterval = 12;
-          s.elements.push(el); return [s];
-        }
-      },
-      {
-        label: 'Text', build() {
-          const s = newSec(); s.name = 'Text'; s.flags = { drawFront: true, clearBuffer: true };
-          const el = newEl('ClippedText'); el.fields.text = 'Hello, World!'; el.fields.yOffset = 32;
-          s.elements.push(el); return [s];
-        }
-      },
-      {
-        label: 'Scrolltext', build() {
-          const s = newSec(); s.name = 'Scrolltext'; s.flags = { drawFront: true, clearBuffer: true };
-          const el = newEl('HScrollText');
-          el.fields.text = 'MONO DISPLAY — scrolling ticker — 🚀 ';
-          el.fields.yOffset = 32; el.fields.scrollSpeed = 50;
-          el.flags.endless = true; el.flags.invertDirection = false;
-          s.elements.push(el); return [s];
-        }
-      },
-      {
-        label: 'Time', build() {
-          const s = newSec(); s.name = 'Time'; s.flags = { drawFront: true, clearBuffer: true };
-          const defs = [
-            { flags: {}, yOffset: 8 }, { flags: { clock12h: true }, xOffset: 40, yOffset: 16 },
-            { flags: { clock12h: true, showHours: true }, yOffset: 24 },
-            { flags: { clock12h: true, showHours: false }, xOffset: 40, yOffset: 32 },
-            { flags: { clock12h: true, showSeconds: true }, xOffset: 120, yOffset: 32 },
-          ];
-          defs.forEach(d => {
-            const el = newEl('CurrentTime');
-            Object.assign(el.fields, { utcOffsetMinutes: 120, xOffset: d.xOffset || 0, yOffset: d.yOffset });
-            el.flags = d.flags; s.elements.push(el);
-          });
-          return [s];
-        }
-      },
-    ];
-
-    // ─── Preview via MonoDisplayFile (same as original demos) ────────────────────
-    const DEMO_PREVIEWS = {
-      Checkerboard() {
-        const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-        const pixels = new Uint8Array(W * H);
-        for (let y = 0; y < H; y++)for (let x = 0; x < W; x++)pixels[y * W + x] = (x + y) % 2;
-        return new MonoDisplayFile({
-          width: W, height: H,
-          elements_always: [{ type: ElementType.Image2D, pixels, width: W, height: H }]
-        }).toBuffer();
-      },
-      Blink() {
-        const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-        return new MonoDisplayFile({
-          elements_always: {
-            flags: { drawFront: true, clearBuffer: true },
-            elements: [{
-              type: ElementType.Animation, width: W, height: H, updateInterval: 12,
-              frames: [{ pixels: new Uint8Array(W * H).fill(1) }, { pixels: new Uint8Array(W * H).fill(0) }]
-            }]
-          }
-        }).toBuffer();
-      },
-      Text() {
-        const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-        return new MonoDisplayFile({
-          elements_always: {
-            flags: { drawFront: true, clearBuffer: true },
-            elements: [{ type: ElementType.ClippedText, text: 'Hello, World!', xOffset: 0, yOffset: 32, width: W, height: 16 }]
-          }
-        }).toBuffer();
-      },
-      Scrolltext() {
-        const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-        return new MonoDisplayFile({
-          elements_always: {
-            flags: { drawFront: true, clearBuffer: true },
-            elements: [{
-              type: ElementType.HScrollText, text: 'MONO DISPLAY — scrolling ticker — 🚀 ',
-              xOffset: 0, yOffset: 32, width: W, height: 16, scrollSpeed: 50, flags: { endless: true, invertDirection: false }
-            }]
-          }
-        }).toBuffer();
-      },
-      Time() {
-        const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-        return new MonoDisplayFile({
-          elements_always: {
-            flags: { drawFront: true, clearBuffer: true }, elements: [
-              { flags: {}, type: ElementType.CurrentTime, xOffset: 0, yOffset: 8, width: W, height: 16, utcOffsetMinutes: 120 },
-              { flags: { clock12h: true }, type: ElementType.CurrentTime, xOffset: 40, yOffset: 16, width: W, height: 16, utcOffsetMinutes: 120 },
-              { flags: { clock12h: true, showHours: true }, type: ElementType.CurrentTime, xOffset: 0, yOffset: 24, width: W, height: 16, utcOffsetMinutes: 120 },
-              { flags: { clock12h: true, showHours: false }, type: ElementType.CurrentTime, xOffset: 40, yOffset: 32, width: W, height: 16, utcOffsetMinutes: 120 },
-              { flags: { clock12h: true, showSeconds: true }, type: ElementType.CurrentTime, xOffset: 120, yOffset: 32, width: W, height: 16, utcOffsetMinutes: 120 },
-            ]
-          }
-        }).toBuffer();
-      },
-    };
-
-    function initDemos() {
-      const wrap = document.getElementById('demo-btns');
-      let activeBtn = null;
-      DEMO_DEFS.forEach(d => {
-        const btn = document.createElement('button');
-        btn.className = 'tb-btn'; btn.textContent = d.label;
-        btn.onclick = async () => {
-          const ok = await guardDirty();
-          if (!ok) return;
-          // load into editor
-          sections = d.build();
-          activeSec = sections[0]?.id || null; activeEl = null;
-          currentFilename = d.label.toLowerCase();
-          document.getElementById('filename').textContent = currentFilename;
-          markClean(); render();
-          // drive preview with full fidelity build
-          if (!window._mdDriver)
-            window._mdDriver = new window.MonoDisplay.MonoDisplayDriver('canvas_root', { onColor: '#EC0', offColor: '#000', fps: 25 });
-          window._mdDriver.load(() => Promise.resolve(DEMO_PREVIEWS[d.label]()));
-          if (activeBtn) activeBtn.style.color = '';
-          btn.style.color = '#33ff66'; activeBtn = btn;
-        };
-        wrap.appendChild(btn);
-      });
-    }
-
-    // ─── Render ───────────────────────────────────────────────────────────────────
-    function render() {
-      updateMeta();
-      const wrap = document.getElementById('sections-wrap');
-      if (!sections.length) {
-        wrap.innerHTML = '<div class="empty-state">No sections yet.<br/>Use <b>Add section</b> to get started.</div>';
-        return;
-      }
-      wrap.innerHTML = sections.map(s => renderSection(s)).join('');
-    }
-
-    function renderSection(s) {
-      const isActive = activeSec === s.id, isOpen = s.open;
-      return `
-<div class="sec-card${isActive ? ' active' : ''}${isOpen ? ' open' : ''}" id="sc-${s.id}">
-  <div class="sec-hdr${isActive ? ' active' : ''}" onclick="toggleSection('${s.id}')">
-    <span class="sec-arrow">▶</span>
-    <span class="sec-label">${esc(s.name)}</span>
-    <span class="sec-badge">${s.elements.length} el</span>
-    <button class="x-btn" title="Remove section" onclick="event.stopPropagation();removeSection('${s.id}')">×</button>
-  </div>
-  ${isOpen ? `
-  <div class="el-list">
-    ${s.elements.map(el => renderElement(s.id, el)).join('')}
-    <button class="add-el" onclick="addElement('${s.id}')">+ add element</button>
-  </div>`: ''}
-</div>`;
-    }
-
-    function renderElement(secId, el) {
-      const isActive = activeEl && activeEl.secId === secId && activeEl.elId === el.id;
-      const fields = EL_FIELDS[el.type] || [];
-      const flags = EL_FLAGS[el.type] || [];
-      return `
-<div class="el-item${isActive ? ' active' : ''}" id="eli-${el.id}">
-  <div class="el-item-hdr" onclick="selectElement('${secId}','${el.id}')">
-    <span class="el-type">${el.type}</span>
-    <span class="el-name">${elSummary(el)}</span>
-    <button class="x-btn" title="Remove element" onclick="event.stopPropagation();removeElement('${secId}','${el.id}')">×</button>
-  </div>
-  ${isActive ? `
-  <div class="el-fields">
-    <div class="field full">
-      <label>Type</label>
-      <select onchange="changeElType('${secId}','${el.id}',this.value)">
-        ${EL_TYPES.map(t => `<option value="${t}"${t === el.type ? ' selected' : ''}>${t}</option>`).join('')}
-      </select>
-    </div>
-    <div class="fields-grid">
-      ${fields.map(f => `
-      <div class="field${f.full ? ' full' : ''}">
-        <label>${f.l}</label>
-        ${f.t === 'text'
-          ? `<textarea onchange="setElField('${secId}','${el.id}','${f.k}',this.value)">${esc(el.fields[f.k] ?? f.d)}</textarea>`
-          : `<input type="number" value="${el.fields[f.k] ?? f.d}" onchange="setElField('${secId}','${el.id}','${f.k}',+this.value)"/>`
-        }
-      </div>`).join('')}
-    </div>
-    ${flags.length ? `
-    <div class="field full">
-      <label>Flags</label>
-      <div class="flags-row">
-        ${flags.map(f => `
-        <label class="flag-check">
-          <input type="checkbox" ${el.flags[f.k] ? 'checked' : ''} onchange="setElFlag('${secId}','${el.id}','${f.k}',this.checked)"/>
-          ${f.l}
-        </label>`).join('')}
-      </div>
-    </div>`: ''}
-  </div>`: ''}
-</div>`;
-    }
-
-    function elSummary(el) {
-      if (el.fields.text) return esc(el.fields.text.slice(0, 24) + (el.fields.text.length > 24 ? '…' : ''));
-      return `${el.fields.xOffset ?? 0}, ${el.fields.yOffset ?? 0}`;
-    }
-    function esc(s) { return String(s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;') }
-
-    function updateMeta() {
-      const s = activeSec ? getSec(activeSec) : null;
-      document.getElementById('meta-name').textContent = s ? s.name : '—';
-      document.getElementById('meta-count').textContent = s ? s.elements.length + ' element(s)' : '—';
-      document.getElementById('flag-drawFront').checked = s ? !!s.flags.drawFront : false;
-      document.getElementById('flag-clearBuffer').checked = s ? !!s.flags.clearBuffer : false;
-    }
-
-    // ─── Preview ──────────────────────────────────────────────────────────────────
-    let previewTimer = null;
-    function triggerPreview() {
-      clearTimeout(previewTimer);
-      previewTimer = setTimeout(() => { try { buildPreview(); } catch (e) { console.warn('preview', e); } }, 150);
-    }
-    function buildPreview() {
-      if (!window.MonoDisplay) return;
-      const { MonoDisplayDriver, MonoDisplayFile, ElementType } = window.MonoDisplay;
-      if (!window._mdDriver)
-        window._mdDriver = new MonoDisplayDriver('canvas_root', { onColor: '#EC0', offColor: '#000', fps: 25 });
-      const s = activeSec ? getSec(activeSec) : sections[0];
-      if (!s || !s.elements.length) {
-        window._mdDriver.load(() => Promise.resolve(new MonoDisplayFile({ elements_always: [] }).toBuffer()));
-        return;
-      }
-      const elDefs = s.elements.map(el => ({ type: ElementType[el.type], ...el.fields, flags: el.flags })).filter(e => e.type != null);
-      window._mdDriver.load(() => Promise.resolve(
-        new MonoDisplayFile({ elements_always: { flags: s.flags, elements: elDefs } }).toBuffer()
-      ));
-    }
-
-    // ─── Load / Export ────────────────────────────────────────────────────────────
-    function loadBin(input) {
-      const file = input.files[0]; if (!file) return;
-      currentFilename = file.name;
-      document.getElementById('filename').textContent = file.name;
-      const reader = new FileReader();
-      reader.onload = e => {
-        const buf = new Uint8Array(e.target.result);
-        if (!window._mdDriver && window.MonoDisplay)
-          window._mdDriver = new window.MonoDisplay.MonoDisplayDriver('canvas_root', { onColor: '#EC0', offColor: '#000', fps: 25 });
-        if (window._mdDriver) window._mdDriver.load(() => Promise.resolve(buf));
-      };
-      reader.readAsArrayBuffer(file);
-      input.value = ''; markClean();
-    }
-    function exportBin() {
-      if (!window.MonoDisplay) { alert('MonoDisplay library not loaded.'); return; }
-      const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-      const s = activeSec ? getSec(activeSec) : sections[0];
-      if (!s) { alert('Nothing to export.'); return; }
-      const elDefs = s.elements.map(el => ({ type: ElementType[el.type], ...el.fields, flags: el.flags })).filter(e => e.type != null);
-      const buf = new MonoDisplayFile({ elements_always: { flags: s.flags, elements: elDefs } }).toBuffer();
-      const blob = new Blob([buf], { type: 'application/octet-stream' });
-      const a = document.createElement('a');
-      a.href = URL.createObjectURL(blob);
-      a.download = currentFilename.replace(/\.bin$/, '') + '.bin';
-      a.click(); markClean();
-    }
-
-    // ─── Init ─────────────────────────────────────────────────────────────────────
-    render();
-    if (window.MonoDisplay) { initDemos(); }
-    else { const iv = setInterval(() => { if (window.MonoDisplay) { clearInterval(iv); initDemos(); } }, 100); }
-  </script>
-</body>
-
-</html>
\ No newline at end of file
