fix: other demos

ts/index.html

@@ -154,12 +154,15 @@
         label: "Text (centered)",
         make() {
           return new MonoDisplayFile({
-            elements_always: [{
-              type: ElementType.ClippedText,
-              text: "Hello, World!",
-              xOffset: 0, yOffset: 32,
-              width: W, height: 16,
-            }],
+            elements_always: {
+              flags: { drawFront: true, clearBuffer: true },
+              elements: [{
+                type: ElementType.ClippedText,
+                text: "Hello, World!",
+                xOffset: 0, yOffset: 32,
+                width: W, height: 16,
+              }],
+            },
           }).toBuffer();
         },
       },
@@ -167,14 +170,17 @@
         label: "Scrolltext (left)",
         make() {
           return new MonoDisplayFile({
-            elements_always: [{
-              type: ElementType.HScrollText,
-              text: "MONO DISPLAY — scrolling ticker — 🚀 ",
-              xOffset: 0, yOffset: 32,
-              width: W, height: 16,
-              scrollSpeed: 50, // (50+1)/16 ≈ 3.2 px/tick at 25fps ≈ 80px/s
-              flags: { endless: true, invertDirection: false },
-            }],
+            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();
         },
       },