feat: add CodeMirror 6 i18n, improve network graph UX, bump v2026.4.303}
- Add i18n/l10n support for CodeMirror 6 search/replace UI phrases via EditorState.phrases, wired to the existing translation system - Add cm.* translation keys to all 28 language JSON files - Refactor network graph DragScrollr with touch support, momentum/ inertia scrolling, and native overflow scroll with hidden scrollbars - Use Bootstrap CSS custom properties (--bs-info, --bs-success, etc.) for network graph lane colors instead of hardcoded values - Improve network commit overlay styling with theme-aware light/dark mode using inverted backgrounds for better contrast - Update AGENTS.md to document Raphaël SVG API gotchas and jQuery 4.0 event binding conventions - Bump version to v2026.4.303 and update CSS cache-bust hash across package.json, themes.js, and all documentation footers