feat: Add event detail modal with markdown rendering and editing (WYSIWYG)

[cybersader]

This PR adds the ability to click on timeline events to view and edit their details with a rich editing experience.

Features

WYSIWYG Event Editor (New!)

• True inline formatting using CodeMirror 6
  • Bold, italic, strikethrough render inline (syntax hidden un
    til cursor is on that
    line)
  • Interactive checkboxes for task lists (click to toggle)
  • Fenced code block highlighting with background styling
  • Links display as clickable text, URL hidden until editing
• Full undo/redo support (Ctrl+Z, Ctrl+Shift+Z)
• Editable event titles directly in the modal header

Date/Time Picker

• Combined datetime-local inputs for From/To dates
• Smart time display (only shows time when not midnight)
• Live summary preview of formatted date range
• Updates event dates when saved

Editor Mode Settings

• Settings toggle to switch between:
  • WYSIWYG mode (default) - Rich text editing with inline form
    atting
  • Plain text mode - Split view (source + preview) or source o
    nly

Event Detail Modal

• Click any event in the timeline to open the modal
• Event title and date range (with time support)
• Tags displayed as styled badges
• Full markdown-rendered description

Bug Fixes

• Fixed title parsing bug with times containing colons (e.g., 1
  0:30am)
• Cleaner date format when dragging events on timeline
• Fixed file switching issues where colors would disappear and
  clicks became
  unreliable

Technical Changes

• New WysiwygEventModal.ts - WYSIWYG modal implementation
• New src/editor/WysiwygEditor.ts - CodeMirror 6 WYSIWYG editor
  component
• New EventDetailModal.ts - Plain text modal (split view/source
  only)
• Updated MarkwhenView.ts - Routes to correct modal based on se
  ttings
• Updated main.ts - Added editorMode setting with UI toggle
• Updated dateTimeUtilities.ts - Improved date formatting
• New CodeMirror dependencies (@codemirror/commands, @codemirro
  r/lang-markdown,
  @codemirror/language)
• Comprehensive CSS styling for both modal types

Closes #4, Related to #22, #43

[cybersader]

Obsidian_myoAFNpD01.mp4

[cybersader]

I couldn't figure out a WYSIWYG editor for this - seems there's not an obvious way to do this since Obsidian uses its own code mirror 6 under the hood to do this. Then again, I very well don't probably know what I'm talking about since this is my first Obsidian plugin contribution

[cybersader]

Attempting to refactor or revive the WYSIWYG approach

[cybersader]

Obsidian_aUoVRuanZF.mp4