feat(fortune-wheel): celebration reveal, spin animation, prize editor add/remove

Player experience:
- Tiered win celebration overlay (WheelWinReveal): quiet message for the
  "nothing" slice, lighter reveal for common prizes, full confetti +
  jackpot glow for rare ones. Rarity classified client-side by type +
  amount (wheelPrizeTier), shared icon rendering (wheelPrizeIcon).
- Three-phase spin motion (wind-back -> overshoot -> settle) with a
  reduced-motion fast path; responsive wheel scaling via ResizeObserver.

Reveal-timing fix:
- The server pushes the refreshed winners list (which already contains the
  just-won prize) the instant it answers the spin, ~5s before the wheel
  stops. useFortuneWheel now buffers that update mid-spin and flushes it in
  finishSpin so the prize is no longer spoiled in the winners panel.
- handleTransitionEnd only reacts to the wheel's own transform transition,
  so a child icon's bubbling transitionend can't advance the spin phase
  machine early.

Prize editor (admin):
- Add/Remove prize buttons in FortuneWheelSettingsView. New rows carry a
  negative temp id collapsed to 0 on the wire (server inserts); removed rows
  are simply omitted (server soft-disables). Requires the matching emulator
  change to WheelManager.savePrize / WheelAdminSavePrizesEvent.

i18n: wheel.win.* and rarevalues.editor.add/remove in en/it/nl.

public/configuration/UITexts_nl.json5.example

@@ -644,6 +644,9 @@
     'wheel.buy':            'Draaibeurt kopen',
     'wheel.winners':        'Laatste winnaars',
     'wheel.winners.empty':  'Nog geen winnaars',
+    'wheel.win.title':      'Gewonnen!',
+    'wheel.win.jackpot':    '★ Jackpot ★',
+    'wheel.win.nothing':    'Volgende keer beter!',
 
     // ------------------------------------------------------------------------
     // Soundboard
@@ -676,6 +679,8 @@
     'rarevalues.editor.weight':       'Kans',
     'rarevalues.editor.label':        'Label',
     'rarevalues.editor.save':         'Opslaan',
+    'rarevalues.editor.add':          '+ Prijs toevoegen',
+    'rarevalues.editor.remove':       'Prijs verwijderen',
     'rarevalues.editor.cat.item':     'Meubel (ID)',
     'rarevalues.editor.cat.spin':     'Extra draaien',
     'rarevalues.editor.cat.nothing':  'Niets',