fix(desktop): preserve glyphs at transcript clip edges

apps/desktop/src/renderer/styles/chat-message.css

@@ -136,6 +136,12 @@
    anchoring when a skipped block leaves and re-enters the viewport. */
 .maka-chat-message-list [data-maka-transcript-boundary] {
   content-visibility: auto;
+  /* `content-visibility` supplies paint containment as well as skipping.
+     Assistant ghost bubbles are deliberately flush-left, and Chromium can
+     rasterize the first CJK glyph a fraction outside that content box; at a
+     zero-width clip edge it then shaves the glyph's leading stroke. Preserve
+     a tiny paint apron while keeping the boundary independently skippable. */
+  overflow-clip-margin: 2px;
   /* First-paint intrinsic-size ESTIMATE for scroll-anchor stability, not a
      fixed height: `auto <n>px` still grows to the block's real size after
      paint. 96px is the single-line answer baseline; tall multi-line blocks

apps/desktop/stories/app-shell.stories.tsx

@@ -964,9 +964,16 @@ export const WideAssistantProse: Story = {
     const paragraph = await within(answer).findByRole('paragraph');
     const turn = paragraph.closest<HTMLElement>('.maka-turn');
     if (!turn) throw new Error('Wide assistant paragraph did not render inside a turn');
+    const boundary = paragraph.closest<HTMLElement>('[data-maka-transcript-boundary]');
+    if (!boundary) throw new Error('Wide assistant paragraph has no paint-containment boundary');
     const turnRect = turn.getBoundingClientRect();
     expect(turnRect.width).toBeGreaterThan(680);
     expect(turnRect.right - paragraph.getBoundingClientRect().right).toBeLessThanOrEqual(1);
+    // `content-visibility: auto` implies paint containment. CJK glyph ink can
+    // extend a fraction past its line box, so a flush-left answer needs a
+    // small clip margin or Chromium shaves the first glyph on every line.
+    expect(getComputedStyle(boundary).contentVisibility).toBe('auto');
+    expect(Number.parseFloat(getComputedStyle(boundary).overflowClipMargin)).toBeGreaterThanOrEqual(2);
   },
 };