fix: timeline tooltip positioning to account for left padding

- Add controlsWidth offset to tooltip left position
- Tooltip now appears correctly at mouse cursor position

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/timeline/TimeScale.tsx

@@ -252,8 +252,8 @@ export function TimeScale({
           className="absolute top-full mt-1 px-2 py-1 bg-popover border border-border rounded shadow-lg text-xs font-mono pointer-events-none z-10"
           style={{
             left: `${Math.min(
-              viewportWidth - 60,
-              Math.max(0, (hoverTime / duration) * totalWidth - scrollLeft - 30)
+              viewportWidth - 60 + controlsWidth,
+              Math.max(controlsWidth, (hoverTime / duration) * totalWidth - scrollLeft - 30 + controlsWidth)
             )}px`,
           }}
         >