…packages with JavaScript implementations and utility scripts.

- Add conditional import resolution in code generator (prioritize web over IO)
- Skip dart:io imports entirely for web platform target
- Fix ImportAnalyzer to resolve conditional imports in symbol mapping
- Prevent global symbol table from overriding correctly-resolved imports
- Add URI redirect map for symbols from native-only files to web variants
- Fix super.union() being incorrectly rewritten as Set spread operation

… development tools, examples, and documentation.

…e submodule

flutterjs_material fixes:
- widget_element.js: setState walks ancestor chain to mark nearest DOM-owning element dirty
- color.js: Color constructor handles instanceof Color identity copy
- decoration.js: BoxDecoration.toCSSObject converts Color to CSS string correctly
- text_field.js: accept onChanged as alias for onChange (Flutter standard API name)

examples/flutterjs_website: update submodule pointer to working website commit
.claude/launch.json: add FlutterJS Website dev server configuration

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…ug fix log

- Complete widget reference table: 50+ widgets across layout, form, nav, dialogs
- TextField usage notes: onChanged vs onChange, maxLines, obscureText
- Bug fixes section: widget_element setState, Color constructor, BoxDecoration, TextField onChanged
- Update website submodule pointer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>