Vamooses Companions

ADDED:
- Toast Position: "Move Toast" mode in Display settings lets you drag the
  talking head popup to any screen position. Position persists across sessions.
  Reset button restores default TOP-CENTER placement. Preview shows accent
  border as drag affordance. Real quotes suppressed during move mode.
- Linked Battle Pet: Each companion can have a linked battle pet that
  auto-summons when that companion is selected. Section appears below the
  signature quote in the Companion tab. Pet selector popup with search and
  full collection browsing. Auto-resummon after loading screens, pet battles,
  and vehicle exits. Manual override detection (if you summon a different pet
  manually, VC won't fight it until the next companion switch).
- Auto-Summon settings: Global toggles in Display tab for auto-summon and
  auto-resummon behavior.

FIXED:
- Portrait: Fixed companion getting stuck in DISTRESSED (Cower) animation on
  flight paths. PLAYER_CONTROL_LOST fires on taxi, and the priority chain
  checked _controlLost before UnitOnTaxi, so DISTRESSED always won. Now
  checks UnitOnTaxi first so the companion shows FLYING on flight paths.
- Debug: Fixed side panel overlay not updating when animation state changes.
  UpdateDebugText was only called from manual anim cycling, not from
  SetPortraitAnimation.