fix(game): show granted/bought hints in-game — finish the D31 wire removal

The in-game hint badge ignored the payments hint wallet: loading a game clobbered
app.profile.hintBalance with the deprecated StateView.wallet_balance (zeroed in the
D31 domain removal but left in the protocol as a dead 0, then synced over the real
balance at game load).

Finish the removal honestly. StateView carries the per-game allowance alone
(hints_remaining); the purchasable wallet lives solely on the profile and the client
adds it (lib/hints). Removed StateView.wallet_balance across every layer — backend
StateView/DTO, notify.PlayerState (live events), gateway StateResp + wire.StateView,
the client model/codec/mock/localgame — and dropped the now-unused wallet arg from
hintsRemaining. The FBS field is tombstoned `(deprecated)` (not deleted) so the vtable
slots after it stay stable across a rolling deploy; no accessor is generated. HintResult
keeps wallet_balance (the real post-spend payments balance the client adopts into the
profile). The StateView type no longer has walletBalance, so the clobber cannot return
without a compile error.

Tests: hintsRemaining (2-arg); hints.hintsLeft (allowance + live wallet, no strip); the
game state/hint integration (allowance-only HintsRemaining); gateway transcode; FBS regen.

ui/src/lib/gamedelta.test.ts

@@ -28,7 +28,7 @@ function move(player: number): MoveRecord {
 }
 
 function cache(moveCount: number, seat = 0, over = false): CachedGame {
-  const view: StateView = { game: gameView(moveCount, over), seat, rack: ['a', 'b'], bagLen: 50, hintsRemaining: 1, walletBalance: 0 };
+  const view: StateView = { game: gameView(moveCount, over), seat, rack: ['a', 'b'], bagLen: 50, hintsRemaining: 1 };
   return { view, moves: [] };
 }
 
@@ -38,7 +38,7 @@ function delta(moveCount: number, player: number, bagLen = 47): MoveDelta {
 
 describe('seedInitialState', () => {
   it('wraps an initial view with an empty journal', () => {
-    const view: StateView = { game: gameView(0), seat: 1, rack: ['x'], bagLen: 80, hintsRemaining: 2, walletBalance: 0 };
+    const view: StateView = { game: gameView(0), seat: 1, rack: ['x'], bagLen: 80, hintsRemaining: 2 };
     expect(seedInitialState(view)).toEqual({ view, moves: [] });
   });
 });
@@ -153,12 +153,12 @@ describe('applyOpponentJoined', () => {
       { seat: 0, accountId: 'me', displayName: 'Me', score: 0, hintsUsed: 0, isWinner: false },
       { seat: 1, accountId: 'opp', displayName: 'Opp', score: 0, hintsUsed: 0, isWinner: false },
     ] };
-    return { game, seat: 0, rack: ['x'], bagLen: 90, hintsRemaining: 0, walletBalance: 0 };
+    return { game, seat: 0, rack: ['x'], bagLen: 90, hintsRemaining: 0 };
   }
 
   it("adopts the joined seats and status while preserving the cached rack and moves", () => {
     // The cached open game is still "searching": empty seats, status open, the starter's own rack.
-    const cached: CachedGame = { view: { game: { ...gameView(2), status: 'open', seats: [] }, seat: 0, rack: ['a', 'b'], bagLen: 50, hintsRemaining: 1, walletBalance: 0 }, moves: [move(0)] };
+    const cached: CachedGame = { view: { game: { ...gameView(2), status: 'open', seats: [] }, seat: 0, rack: ['a', 'b'], bagLen: 50, hintsRemaining: 1 }, moves: [move(0)] };
     const res = applyOpponentJoined(cached, joinedState());
     expect(res?.view.game.status).toBe('active');
     expect(res?.view.game.seats).toHaveLength(2);