ui: improve ultra mode colors, separators, and navigation

- Theme: SelectedBG changed from purple (57) to dark grey (238) so
  selected cards are clearly distinct from the status bar; priority
  badge colors switched to subtler dark variants (red/blue/green)
- Ultra header: ID bold white, urgency amber, age dim, status grey;
  no background on unselected cards (pure black terminal background)
- Priority badge: 3-char wide centred pill with white text
- Annotations: italic and dimmer (244) vs description (253)
- Card separator: full-width ─── line in dim grey (237) instead of
  a blank line, making task boundaries easier to scan
- u key in ultra mode toggles back to table view (syncs cursor);
  from --ultra startup mode u is a no-op since there is no table to
  return to
- q/esc from --ultra startup mode exits directly instead of dropping
  to the table view (ultraStartup flag tracks launch origin)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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