Add freshness bar, enhance overlays and renderers

- Add enemy freshness tracking (novelty bonus for repeated deploys)
- Add freshness bar to sidepanel enemy cards with penalty indicator
- Major overhaul of renderer-overlays.js (790+ lines for UI polish)
- Enhanced combat log, shop overlays, and inventory UI
- Improved weapon/upgrade display with partial ownership colors
- Added element icons and weakness/resistance indicators to cards
- Enhanced radial menu and tooltip system
- Add "stale/%" penalty text when freshness depleted
- Update play link to ffazeshift.net in index.html

js/state.js

@@ -4,7 +4,7 @@
 // ============================================================
 
 // ── ARENA ─────────────────────────────────────────────
-const ARENA_RADIUS = 400; // play area radius; enemies always spawn at this distance from tower
+const ARENA_RADIUS = 720; // play area radius; enemies always spawn at this distance from tower
 const ARENA_CX = 665;    // center x of play area: (1600 - 270) / 2
 const ARENA_CY = 482;    // center y of play area: 64 + (900 - 64) / 2
 
@@ -21,6 +21,9 @@ function makeGameState() {
     _isNewBest: false,
     creditReserve: 50,   // minimum credits kept in reserve — cannot spend upgrades below this
 
+    // Camera
+    camera: { zoom: 0.85, minZoom: 0.57, maxZoom: 1.8 },
+
     // Tower
     tower: {
       hp: 20,
@@ -64,10 +67,10 @@ function makeGameState() {
     selectedEnemyType: null,
     sendQuantity: 1,
 
-    // Shop
-    shopOpen: false,
-    shopTab: 'tower',    // 'tower' | 'weapons' | weapon instance id
-    shopTreeWeapon: null,
+    // Overlay panels — armory (weapons) and command (tower upgrades)
+    armoryOpen:  false,
+    commandOpen: false,
+    weaponDetailSlot: -1,
 
     // Entity id counter
     nextId: 1,
@@ -77,6 +80,16 @@ function makeGameState() {
 
     // Enemy freshness (novelty bonus) — higher = less fresh = less bonus
     enemyFreshness: Object.fromEntries(ENEMY_DEFS.map(d => [d.id, 0])),
+
+    // Difficulty / Prestige
+    difficultyTier: 0,
+    unlockedTiers: [0],
+    prestigeLevel: 0,
+    permanentBonuses: {},
+
+    // Other overlay panels
+    threatOpen: false,
+    prestigeOpen: false,
   };
 }