Fix selection/gesture bugs; add rhombus & clipboard paste (Ctrl/Cmd+V)

[Dcode9]

Motivation

• Fix a runtime-breaking inline script syntax error and harden selection/shape behavior for rotated quadrilaterals.
• Make the quadrilateral tool usable (add visible rhombus) and improve UX for copy/paste and multi-pointer workflows.
• Ensure touch gestures behave intuitively in split view (three-finger swipe to exit when already split).

Description

• Removed a stray token that caused an inline script parse error in index.html and cleaned up the modal promise handler.
• Added a labeled rhombus option in the quadrilateral picker (◇ Rhombus) so rhombus creation is discoverable.
• Reworked bounds/rotation math by introducing getStrokeLocalBounds and a rotated getStrokeBounds, and updated selection overlay/handles to draw and snap correctly around rotated shapes (uses rotatePointAround / pointToStrokeLocal).
• Implemented selection clipboard helpers copySelectedStrokes and pasteSelectedStrokes, wired them to the context menu and keyboard shortcuts (Ctrl/Cmd+C, Ctrl/Cmd+V), and ensure pasted objects are offset and selected.
• Hid the pen/touch assignment dot indicators until both pointer types are observed in the session using a detectedToolPointerTypes set.
• Changed three-finger gesture handling so a three-finger swipe will exitSplitView() if already split, otherwise it creates a split as before.

Testing

• Extracted inline scripts from index.html and ran node --check on each extracted inline script; checks passed.
• Ran node --check on JS files including assets/js/app.js, test.js, and API handlers; checks passed.
• Ran git diff --check to ensure no trailing whitespace/merge markers; check passed.
• Launched a static server with python3 -m http.server and fetched index.html via curl -I which returned HTTP 200 OK.
• Attempted browser-based screenshot capture but no Chromium/Chrome binary is available in the environment (warning only).

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
whiteboard	Ready	Preview, Comment	Jun 6, 2026 3:24pm