fix(editor): prevent padding click handler from closing toolbar on button clicks

[j4rviscmd]

Summary

• Fix the handleWrapperClick guard in Editor.tsx that was dismissing the formatting toolbar when clicking toolbar buttons (e.g. the color picker)
• The guard previously only checked for .bn-editor, but the formatting toolbar and its overlays are rendered as siblings of .bn-editor inside .bn-container — so clicks on toolbar buttons were not caught by the guard
• Changed the guard from target.closest('.bn-editor') to target.closest('.bn-container') so that all BlockNote UI elements (editor, toolbars, menus, color picker dropdowns, etc.) are excluded from the padding-area click handler

Root cause

The editor wrapper has a pb-[60vh] padding zone. Clicking this area calls editor.setTextCursorPosition(lastBlock, 'end') to focus the editor. The guard only excluded clicks inside .bn-editor (the contenteditable), but the formatting toolbar, color picker, and other BlockNote UI are rendered outside .bn-editor (as siblings inside .bn-container). When clicking the color button:

1. pointerup → dropdown opens via MenuTriggerWithPointerUp hack
2. click → bubbles to wrapper → handleWrapperClick runs (passes the .bn-editor guard)
3. editor.setTextCursorPosition(lastBlock, 'end') → selection clears
4. shouldShow() returns false → toolbar unmounts → dropdown disappears

Test plan

• cargo build succeeds
• Select text → formatting toolbar appears → click color button → color palette opens and stays open
• Click padding area below editor → cursor moves to end of last block (original behavior preserved)
• Click inside editor content → no interference with normal editing

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