fix: resolve text block bubble menu color picker positioning, slider drag, and popup layout

[SmrutiSawant]

Summary of Changes

Fixes positioning and interaction issues with the text editor's TextBlockBubbleMenu color picker:

• Position Stability: Anchors bubble menu coordinates relative to the text editor element
• Slider Dragging: Hue and Alpha sliders can be dragged smoothly without being blocked by parent toolbar event handlers.

Before:

Before.mp4

After:

After.mp4

[greptile-apps]

Confidence Score: 4/5

The core positioning and drag fixes look correct, but the shouldShow guard can still dismiss the color picker if selection collapses while it is open.

The shouldShow function places settingColor.value after an early return that fires when there is no text selection. A collapsed selection while the picker is open still closes the bubble menu, meaning the slider-drag fix is not fully robust.

frontend/src/components/TextBlockBubbleMenu.vue — the shouldShow callback ordering

_{Reviews (3): Last reviewed commit: "Update frontend/src/components/TextBlock..." | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.88%. Comparing base (f16bae0) to head (bbab116).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #694   +/-   ##
========================================
  Coverage    56.88%   56.88%           
========================================
  Files           35       35           
  Lines         4217     4217           
========================================
  Hits          2399     2399           
  Misses        1818     1818           

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[stravo1]

The main issue was that the TextBlockBubbleMenu was hidden after losing focus when the user clicked the ColorPicker. A more concise fix was to keep it open while the ColorPicker remained focused.

The Autocomplete for the ColorPicker also jumped to the corner of the screen. Both issues have been fixed in: #695