Canvas UX: shape text editing, eraser fix, session-per-tab, message spacing#2

Merged

dreamteam-mobile merged 10 commits intomainfrom

dev/canvas-ux-enhancements

Feb 19, 2026

Commits on Feb 19, 2026

Add spacing between message name/time and always show join modal per tab
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Fix pen stroke eraser to check line segments and clean up eraser trail
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Add borderless shape text editing with selection highlight and tests
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Fix shape text editing: selection wraps full shape, textarea centered
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Hide shape text on canvas while editing via overlay
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Support multi-line text in shapes with overflow containment
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Allow shape text to overflow during editing instead of clipping
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Fix multi-line text clipping in shape editing and add comprehensive tests
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Auto-resize textarea on mount to preserve multi-line text in edit mode
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Add visible eraser trail that fades on release
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