Add lore depth, fix recruit click bug, add localStorage save

- 20+ new events drawing from Anders Fager, Kult, and Call of Cthulhu:
  ICA cashiers who never blink, SJ trains stopping in non-existent tunnels,
  Kult lictors as city officials, death servants finishing lectures, Deep Ones,
  investigators dreaming about us, stars being right over Lund Observatory
- Rewrite upgrade descriptions to match the register: mundane detail,
  matter-of-fact horror, no melodrama
- Add a new mid-game upgrade (Paktens Förnyelse) to smooth the progression
- Fix recruit button: was destroying DOM every 30fps tick, killing mousedown→click
  events; now only rebuilds when availability/affordability actually changes
- Fix double andakt deduction in recruit effect
- Fix map growing over log (proper flex constraints)
- Add localStorage save/load with versioned key (SAVE_VERSION bump invalidates
  old saves); autosaves every 10s and on upgrade purchase, clears on restart

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

src/main.ts

@@ -1,19 +1,22 @@
 import './style.css';
-import { createState, tick, buyUpgrade } from './engine.ts';
+import { createState, tick, buyUpgrade, saveState, loadState, clearSave } from './engine.ts';
 import { initUI, renderState } from './ui.ts';
 import { initMap, updateMap } from './map.ts';
 
-let state = createState();
+let state = loadState() ?? createState();
 let lastTime = 0;
 const TARGET_FPS = 30;
 const FRAME_MS = 1000 / TARGET_FPS;
+const SAVE_INTERVAL_MS = 10_000;
+let lastSaveTime = 0;
 
 function start(): void {
   const app = document.getElementById('app')!;
 
   initUI(app,
-    (id) => { state = buyUpgrade(state, id); renderState(state); },
+    (id) => { state = buyUpgrade(state, id); renderState(state); saveState(state); },
     () => {
+      clearSave();
       state = createState();
       document.getElementById('overlay')!.classList.remove('visible');
       renderState(state);
@@ -34,6 +37,10 @@ function loop(now: number): void {
       renderState(state);
       updateMap(state.dread, state.areas);
     }
+    if (now - lastSaveTime >= SAVE_INTERVAL_MS) {
+      lastSaveTime = now;
+      saveState(state);
+    }
   }
   requestAnimationFrame(loop);
 }