feat: add search bar to effects picker modal

Mirror the flag/pattern modals with a search input in the EffectsModal
header. Filters the effects grid by name — matching either the raw effect
id or its displayed label — and hides the Default tile while searching,
the same way FlagInputModal hides its no-flag tile.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

resources/lang/en.json

@@ -394,6 +394,7 @@
   },
   "effects": {
     "button_title": "Pick an effect!",
+    "search": "Search...",
     "title": "Effects",
     "type": {
       "transportShipTrail": "Boat Trail"