fix: format hour display on Loop End screen to avoid floating-point precision errors

- Use formatHour() instead of raw {hour} to display time in HH:MM format
  (e.g. '15:00' instead of '14.999999999999998')
- Export formatHour from stores barrel index
- Fixes #336

docs/circular-deps.txt

@@ -1,5 +1,5 @@
 # Circular Dependencies
-Generated: 2026-06-10T07:56:31.400Z
+Generated: 2026-06-10T08:00:19.784Z
 Found: 2 circular chain(s) — these MUST be fixed before modifying involved files.
 
 1. 1) stores/golem-combat-actions.ts > stores/golem-combat-helpers.ts

docs/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-06-10T07:56:29.402Z",
+    "generated": "2026-06-10T08:00:17.492Z",
     "description": "Import dependency graph for src/lib/game. Keys are files, values are arrays of files they import.",
     "usage": "To find what a file affects, search for its path in the VALUES. To find what a file depends on, look at its KEY entry."
   },

src/app/components/GameOverScreen.tsx

@@ -2,7 +2,7 @@
 
 import { Button } from '@/components/ui/button';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
-import { fmt } from '@/lib/game/stores';
+import { fmt, formatHour } from '@/lib/game/stores';
 import { useGameStore } from '@/lib/game/stores';
 
 interface GameOverScreenProps {
@@ -40,7 +40,7 @@ export function GameOverScreen({ day, hour, insightGained, totalInsight }: GameO
               <div className="text-xs text-gray-400">Day Reached</div>
             </div>
             <div className="p-3 bg-gray-800 rounded">
-              <div className="text-xl font-bold text-purple-400 game-mono">{hour}</div>
+              <div className="text-xl font-bold text-purple-400 game-mono">{formatHour(hour)}</div>
               <div className="text-xs text-gray-400">Hour</div>
             </div>
             <div className="p-3 bg-gray-800 rounded">

src/lib/game/stores/index.ts

@@ -32,6 +32,7 @@ export type { GameCoordinatorStore } from './gameStore';
 export {
   fmt,
   fmtDec,
+  formatHour,
   getFloorMaxHP,
   getFloorElement,
   getFloorElements,