Fix: ColorPicker positioning issue inside BubbleMenu

[aditorito]

fix #538

This was caused by the internal popover (Reka UI) failing to correctly calculate the position of its trigger element when used inside the transformed BubbleMenu (Tippy).

Changes made

1. Replaced ColorPicker popover usage with a manual trigger button
2. Removed appendTo / placement and slot-based togglePopover
3. Rendered picker via with render-mode="inline"
4. Positioned picker manually using getBoundingClientRect() + position: fixed
5. Added local state to control open/close and outside click handling
6. Removed .focus() from editor chain to avoid selection updates

Screen.Recording.2026-04-08.024913.mp4

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.93%. Comparing base (1d53a38) to head (d023c4b).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #545   +/-   ##
========================================
  Coverage    57.93%   57.93%           
========================================
  Files           28       28           
  Lines         3105     3105           
========================================
  Hits          1799     1799           
  Misses        1306     1306           

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