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/inventory.js

@@ -41,6 +41,7 @@ function openWeaponPicker(slotIndex) {
   if (slotIndex >= G.tower.weaponSlots) return;
   _pickerSlot    = slotIndex;
   _pickerScrollY = 0;
+  _radialSlot    = -1;
   setPaused(true, false);
   document.body.classList.add('inventory-open');
   G.weaponInventory = G.weaponInventory || [];
@@ -50,7 +51,7 @@ function closeWeaponPicker() {
   document.body.classList.remove('inventory-open');
   _pickerSlot    = -1;
   _pickerScrollY = 0;
-  if (!G.shopOpen) setPaused(false);
+  if (!G.armoryOpen && !G.commandOpen) setPaused(false);
 }
 
 function equipWeaponInstanceToSlot(slotIndex, instanceId) {