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/shop.js

@@ -1,24 +1,86 @@
 // ═══ shop.js ═══
 // ============================================================
-//  SHOP.JS — Shop state management (canvas draws each frame)
+//  SHOP.JS — Armory / Command overlay state management
 // ============================================================
 
-function openShop() {
+function openArmory() {
   if (G.gameOver) return;
-  G.shopOpen = true;
+  G.armoryOpen  = true;
+  G.commandOpen = false;
+  G.threatOpen  = false;
+  G.prestigeOpen = false;
+  _radialSlot = -1;
   _shopScrollY = 0;
   setPaused(true, false);
 }
 
-function closeShop() {
-  G.shopOpen = false;
+function closeArmory() {
+  G.armoryOpen = false;
   _shopScrollY = 0;
   setPaused(false);
 }
 
-function setShopTab(tab) {
-  G.shopTab = tab;
+function openCommand() {
+  if (G.gameOver) return;
+  G.commandOpen = true;
+  G.armoryOpen  = false;
+  G.threatOpen  = false;
+  G.prestigeOpen = false;
+  _radialSlot = -1;
   _shopScrollY = 0;
+  setPaused(true, false);
 }
 
-function renderShop() { /* canvas draws shop each frame via drawShopOverlay() */ }
+function closeCommand() {
+  G.commandOpen = false;
+  _shopScrollY = 0;
+  setPaused(false);
+}
+
+function openWeaponDetail(slotIndex) {
+  if (!G.weapons[slotIndex]) return;
+  G.weaponDetailSlot = slotIndex;
+  _radialSlot = -1;
+  G.armoryOpen = false;
+  G.commandOpen = false;
+  G.threatOpen = false;
+  G.prestigeOpen = false;
+  _weaponDetailScrollY = 0;
+  setPaused(true, false);
+}
+
+function closeWeaponDetail() {
+  G.weaponDetailSlot = -1;
+  _weaponDetailScrollY = 0;
+  if (!G.armoryOpen && !G.commandOpen) setPaused(false);
+}
+
+function calcSellPrice(weapon) {
+  const def = WEAPON_DEFS.find(d => d.id === weapon.defId);
+  const baseSell = Math.floor((def?.cost ?? 0) * 0.5);
+  const upgTree = WEAPON_UPGRADE_TREES[weapon.defId] || [];
+  const upgSell = (G.weaponUpgradesBought[weapon.instanceId] || []).reduce((sum, id) => {
+    const u = upgTree.find(u => u.id === id);
+    return sum + Math.floor((u?.cost ?? 0) * 0.5);
+  }, 0);
+  return baseSell + upgSell;
+}
+
+function renderShop() { /* no-op — render loop redraws every frame */ }
+
+function sellWeapon(slotIndex) {
+  const w = G.weapons[slotIndex];
+  if (!w) return;
+  const activeCount = (G.weapons || []).slice(0, G.tower.weaponSlots).filter(x => x != null).length;
+  if (activeCount <= 1) { addLog('Cannot sell last weapon!', 'lose'); return; }
+  const price = calcSellPrice(w);
+  removeWeaponFromSlot(slotIndex);
+  const invIdx = (G.weaponInventory || []).findIndex(x => x.instanceId === w.instanceId);
+  if (invIdx >= 0) G.weaponInventory.splice(invIdx, 1);
+  G.credits += price;
+  _radialSlot = -1;
+  _sellHoldSlot = -1;
+  closeWeaponDetail();
+  addLog('Sold ' + getWeaponDef(w).name + ' for ' + price + '¢.', 'win');
+  updateHUD();
+}