cc-sidepanel: extension icon, wired as icons + action.default_icon (0.2.0)

Gemini-generated via the geminigen MCP: a flat vector browser window with a
docked side panel and three chat lines inside it, on dark indigo. Gemini buried
the symbol in ~75% white margin, so it's cropped tight with PIL and resized to
16/32/48/128.

The violet/teal/gold lines are the exact three colours the parser already uses
for user, assistant and heartbeat blocks. Unplanned, but it reads like a brand.

ORB's orb was considered and dropped — dense detail reduces to a purple blob at
16px.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

extension/manifest.json

@@ -1,9 +1,23 @@
 {
   "manifest_version": 3,
   "name": "CC Sidepanel",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "description": "Live window into a Claude Code seat, right in the browser sidebar.",
-  "action": { "default_title": "CC Sidepanel" },
+  "icons": {
+    "16": "icons/icon16.png",
+    "32": "icons/icon32.png",
+    "48": "icons/icon48.png",
+    "128": "icons/icon128.png"
+  },
+  "action": {
+    "default_title": "CC Sidepanel",
+    "default_icon": {
+      "16": "icons/icon16.png",
+      "32": "icons/icon32.png",
+      "48": "icons/icon48.png",
+      "128": "icons/icon128.png"
+    }
+  },
   "side_panel": { "default_path": "sidepanel.html" },
   "background": { "service_worker": "background.js" },
   "permissions": ["sidePanel", "storage"],