Wire up @codemirror/lang-markdown with a custom HighlightStyle to
highlight headings, bold, italic, strikethrough, links, lists,
blockquotes, and inline code in the raw CodeMirror editor. The custom
frontmatter plugin is kept for YAML highlighting; its heading
decoration is removed in favour of the language-based parser.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Remove all theme switching, creation, and management functionality
from the app — backend (Rust theme module, Tauri commands, menu items,
startup tasks, vault seeding), frontend (useThemeManager, ThemePropertyEditor,
themeSchema, command palette Appearance group, settings panel appearance
section, isDarkTheme prop chain), mock data, and all related tests.
Editor styling via theme.json/EditorTheme.css is preserved (not user theming).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adds line numbers, current line highlight, and syntax highlighting
(YAML frontmatter keys/values, --- delimiters, markdown headings).
Extracted useCodeMirror hook and frontmatterHighlight extension.
Preserves wikilink autocomplete, Cmd+S save, and Escape dismiss.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
