- Match gutter font-size to textarea (13.5px) so line heights align
- Always sync gutter scrollTop regardless of mode
- Sync gutter scroll position after undo/redo history apply
- _updateModeButtons now disables edit-action buttons in preview mode
- Mode-switch buttons (edit/split/preview/fullscreen) and undo/redo remain active
- CSS: .me-btn:disabled with opacity 0.35, cursor not-allowed, pointer-events none
- Constructor calls _updateModeButtons on init for correct initial state
feat(core): line number gutter with current line highlight
- .me-gutter rendered alongside textarea, sync-scrolls with content
- .me-gutter-active highlights the line containing the cursor
- config.lineNumbers (default true) to toggle
feat(core): smart Enter auto-formatting
- List continuation: '- ' / '1. ' auto-insert on Enter at end of list item
- Ordered list auto-increment: '1.' → '2.'
- Quote continuation: '> ' auto-insert on Enter at end of quote line
- Empty list/quote item: Enter removes the marker (end list)
feat(core): bracket/quote auto-close
- (), [], {}, <>, "", '', ``, **, __ auto-close pairs
- Selection wrapping: select text then press ( → wraps as (text)
- config.autoBrackets (default true) to toggle
feat(core): drag & drop file support
- Drop image files → auto base64 inline insert 
- Drop text/code files → insert file contents
- Drop external text from browser → insert at cursor
feat(core): outline/TOC panel
- Extracts headings from rendered HTML preview
- Nested tree with indentation by heading level
- Click to scroll-jump in both preview and textarea
- config.outline (default false) to toggle
style: gutter, outline panel, current line highlight CSS
test: 11 new tests for gutter, auto-format, bracket close, outline (532 total)
chore: bump version 0.1.6 → 0.1.7 across all files, site, types
feat(themes): comprehensive theme system enhancement
- Fix resolveTheme('auto') always resolves to system theme (no stale override)
- Add per-instance theme isolation via createInstanceTheme()
- Add MarkdownEditor.setTheme()/getTheme()/getThemeContext() instance methods
- Add 'themeChange' instance event with { theme, resolved, config } payload
- Multi-instance independent themes (no cross-contamination)
feat(themes): external theme following (v0.1.5)
- followExternalTheme() — follow theme via data attr, CSS class, or callback
- adoptFromParent() — inherit theme from parent container
- watch() — watch external theme source (function or selector)
feat(themes): extensibility (v0.1.5)
- registerTheme() supports 'extends' option for theme inheritance
- exportCSSVars() — export all CSS variable values from element
- getCSSVariable() — query single CSS variable
- applyThemeToElement() — apply theme to any DOM element
chore: bump version 0.1.4 → 0.1.5 across all files
test(themes): 30 new tests covering all v0.1.5 theme APIs (499 total)
thzxx