* feat(code): isolate Design JSX execution
- Transform JSX with the existing Sucrase dependency and execute it in a disposable opaque-origin iframe worker
- Block ambient network capabilities and enforce source, timeout, output, depth, and element limits
- Validate that only bounded plain structured data returns to the application
* feat(code): add editable Design JSX
- Add a lazy CodeMirror editor with JSX syntax support, completion, diagnostics, and bounded scrolling
- Convert validated sandbox output into trusted Design JSX helpers before rendering
- Apply or insert JSX as one undoable graph transaction while preserving dirty drafts
* feat(code): localize JSX editor actions
- Add translated-message fallbacks for editing, applying, inserting, and draft state
- Document the editable JSX workflow in the unreleased changelog
* fix(code): satisfy typed sandbox validation
- Keep the sandbox document terminator literal and preserve optional selection handling under type-aware lint
* test(code): resolve sandbox probes through app aliases
* fix(code): bound sandbox results before cloning
- Enforce string, array, object, depth, element, and byte limits inside the disposable worker
- Retain host-side validation as a second structured-data boundary
* fix(code): keep JSX and HTML editing modes separate
- Switch generated Tailwind output back to OpenPencil JSX before editing
- Close the JSX editor when opening HTML/CSS import and avoid stacking both editors
* feat(code): support authored Design JSX programs
- Allow local constants, function components, arrays, conditionals, fragments, and multiple roots
- Preserve replacement positions for multiple selected roots and reject mixed-parent or locked selections
- Cover multi-root undo, redo, and all-or-nothing rollback
* feat(code): add explicit JSX view mode
- Let authors leave CodeMirror without applying a draft
- Keep the editable surface and HTML/CSS importer mutually exclusive
* feat(code): diagnose unknown JSX vocabulary
- Warn on OpenPencil elements and properties that are absent from the canonical schema
- Surface diagnostics inline through CodeMirror lint markers
* test(code): accept WebKit isolation diagnostics
- Cover the sandbox architecture against Playwright WebKit
- Accept engine-specific wording while preserving the same unavailable-window assertion
* refactor(code): consolidate Design JSX vocabulary
- Drive renderer warnings, completion, and diagnostics from one supported-property schema
- Recognize locally declared components and add focused schema and transform tests
- Replace CodeMirror basicSetup with an explicit feature set and remove the umbrella package
* fix(code): support Design JSX variable helpers
* refactor(code): unify JSX sandbox validation
* fix(code): account for complete sandbox output
* fix(code): preserve locked JSX descendants
* fix(code): preserve JSX sibling order
* fix(code): recompute JSX parent layouts
* feat(code): add live code previews
* test(code): centralize graph assertions
* fix(code): harden live preview sessions
* docs: describe live code editing
* fix(code): update editor accessibility labels
* fix(code): use theme-aware error colors
* fix(dev): stop Vite disconnect error loops
* fix(code): clarify live preview status
* fix(ui): avoid tooltip attribute warnings
* test(code): assert semantic preview status
* refactor(code): remove obsolete editor messages
* fix(code): harden preview concurrency and isolation
* fix(code): cancel stale reset previews
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