Fix Finance page: remove Recharts Tooltips, defensive string coercion

Remove chart Tooltip components and wrap fundingStatus.reason in
String() to eliminate possible object-as-React-child errors.

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

apps/web/src/pages/FinancePage.tsx

@@ -1,8 +1,8 @@
 import { useGameStore } from '@/store';
-import { formatMoney, formatPercent, formatNumber, FUNDING_ROUNDS } from '@ai-tycoon/shared';
+import { formatMoney, formatPercent, FUNDING_ROUNDS } from '@ai-tycoon/shared';
 import type { FundingRoundType } from '@ai-tycoon/shared';
-import { TrendingUp, TrendingDown, DollarSign, PiggyBank, BarChart3, Rocket } from 'lucide-react';
-import { AreaChart, Area, XAxis, YAxis, Tooltip, ResponsiveContainer, LineChart, Line } from 'recharts';
+import { TrendingUp, DollarSign, PiggyBank, BarChart3, Rocket } from 'lucide-react';
+import { AreaChart, Area, XAxis, YAxis, ResponsiveContainer, LineChart, Line } from 'recharts';
 import { canRaiseFunding } from '@ai-tycoon/game-engine';
 import type { GameState } from '@ai-tycoon/shared';
 
@@ -10,21 +10,20 @@ export function FinancePage() {
   const money = useGameStore((s) => s.economy.money);
   const revenuePerTick = useGameStore((s) => s.economy.revenuePerTick);
   const expensesPerTick = useGameStore((s) => s.economy.expensesPerTick);
-  const totalRevenue = useGameStore((s) => s.economy.totalRevenue);
-  const totalExpenses = useGameStore((s) => s.economy.totalExpenses);
   const funding = useGameStore((s) => s.economy.funding);
   const history = useGameStore((s) => s.economy.financialHistory);
   const infrastructure = useGameStore((s) => s.infrastructure);
   const talent = useGameStore((s) => s.talent);
   const raiseFunding = useGameStore((s) => s.raiseFunding);
 
-  const gameStateForFunding: GameState = useGameStore((s) => ({
-    meta: s.meta, economy: s.economy, infrastructure: s.infrastructure,
-    compute: s.compute, research: s.research, models: s.models,
-    market: s.market, competitors: s.competitors, talent: s.talent,
-    data: s.data, reputation: s.reputation, events: s.events,
-    achievements: s.achievements,
-  }));
+  const state = useGameStore.getState();
+  const gameStateForFunding: GameState = {
+    meta: state.meta, economy: state.economy, infrastructure: state.infrastructure,
+    compute: state.compute, research: state.research, models: state.models,
+    market: state.market, competitors: state.competitors, talent: state.talent,
+    data: state.data, reputation: state.reputation, events: state.events,
+    achievements: state.achievements,
+  };
   const fundingStatus = canRaiseFunding(gameStateForFunding);
 
   const netIncome = revenuePerTick - expensesPerTick;
@@ -71,10 +70,6 @@ export function FinancePage() {
                 </defs>
                 <XAxis dataKey="tick" hide />
                 <YAxis hide />
-                <Tooltip
-                  contentStyle={{ backgroundColor: '#1e293b', border: '1px solid #334155', borderRadius: '8px' }}
-                  formatter={(v: number) => formatMoney(v)}
-                />
                 <Area type="monotone" dataKey="money" stroke="#6366f1" fill="url(#cashGrad)" />
               </AreaChart>
             </ResponsiveContainer>
@@ -92,10 +87,6 @@ export function FinancePage() {
               <LineChart data={history}>
                 <XAxis dataKey="tick" hide />
                 <YAxis hide />
-                <Tooltip
-                  contentStyle={{ backgroundColor: '#1e293b', border: '1px solid #334155', borderRadius: '8px' }}
-                  formatter={(v: number) => formatMoney(v)}
-                />
                 <Line type="monotone" dataKey="revenue" stroke="#22c55e" dot={false} strokeWidth={2} />
                 <Line type="monotone" dataKey="expenses" stroke="#ef4444" dot={false} strokeWidth={2} />
               </LineChart>
@@ -167,7 +158,7 @@ export function FinancePage() {
                   Raise {formatMoney(FUNDING_ROUNDS[fundingStatus.nextRound! as FundingRoundType].amount)}
                 </button>
               ) : (
-                <span className="text-xs text-warning">{fundingStatus.reason}</span>
+                <span className="text-xs text-warning">{String(fundingStatus.reason ?? '')}</span>
               )}
             </div>
           </div>