Initial release: PokeRogue Type Effectiveness extension

Chrome/Firefox MV3 extension that shows move type effectiveness during
PokeRogue battles. Features:

- Auto-detects battle state via Phaser game bridge (MAIN world)
- Shows effectiveness multiplier, base power, and physical/special category
- Supports single and double battles
- Manual type calculator mode as fallback
- Draggable overlay with dark theme matching PokeRogue aesthetic
- Settings popup with position, opacity, and display options
- Complete Gen 6+ type chart (18 types) from PokeRogue source data
- Type colors matching PokeRogue's own color scheme

manifest.json

@@ -0,0 +1,65 @@
+{
+  "manifest_version": 3,
+  "name": "PokeRogue Type Effectiveness",
+  "version": "1.0.0",
+  "description": "Shows move type effectiveness during PokeRogue battles. Displays multipliers, power, and category for each move against enemy Pokemon.",
+
+  "icons": {
+    "16": "icons/icon-16.png",
+    "32": "icons/icon-32.png",
+    "48": "icons/icon-48.png",
+    "128": "icons/icon-128.png"
+  },
+
+  "action": {
+    "default_icon": {
+      "16": "icons/icon-16.png",
+      "32": "icons/icon-32.png",
+      "48": "icons/icon-48.png",
+      "128": "icons/icon-128.png"
+    },
+    "default_popup": "popup/popup.html",
+    "default_title": "PokeRogue Type Effectiveness"
+  },
+
+  "permissions": ["storage", "activeTab"],
+
+  "host_permissions": [
+    "https://pokerogue.net/*",
+    "https://www.pokerogue.net/*"
+  ],
+
+  "background": {
+    "service_worker": "service-worker.js"
+  },
+
+  "content_scripts": [
+    {
+      "matches": ["https://pokerogue.net/*", "https://www.pokerogue.net/*"],
+      "js": ["data/type-data.js", "content.js"],
+      "css": ["overlay.css"],
+      "run_at": "document_idle",
+      "world": "ISOLATED"
+    },
+    {
+      "matches": ["https://pokerogue.net/*", "https://www.pokerogue.net/*"],
+      "js": ["game-bridge.js"],
+      "run_at": "document_idle",
+      "world": "MAIN"
+    }
+  ],
+
+  "web_accessible_resources": [
+    {
+      "resources": ["icons/*"],
+      "matches": ["https://pokerogue.net/*", "https://www.pokerogue.net/*"]
+    }
+  ],
+
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "pokerogue-type-effectiveness@vectry.tech",
+      "strict_min_version": "109.0"
+    }
+  }
+}