javier fa699b5399 feat: Wino-style compact mail view with display modes + hover actions ...

- CompactMailDelegate: 3 display modes (Compact/Medium/Spacious) like WinUI original
  * Compact: 64px, minimal, no preview
  * Medium: 96px, with preview, detailed categories
  * Spacious: 120px, full padding, preview visible
- Hover actions: Reply (↩), Forward (↪), Mark unread (✎) on right side
- Unread dot indicator (top-right, blue) like WinUI
- User-configurable display mode via combo box in filter bar
- MainMainWindow handlers for reply/forward/mark-unread from compact view
- Signals: replyRequested, forwardRequested, markUnreadRequested

2026-08-25 13:41:43 +02:00

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