Clean up browser-extension references from monorepo

- Update README.md to reference sitegeist repo
- Update CLAUDE.md to replace browser-extension with web-ui
- Update packages/web-ui/README.md examples to point to sitegeist
- Remove browser-extension exclude from tsconfig.json
- Remove browser-extension from .claude/settings.local.json permissions

tsconfig.json

@@ -10,6 +10,5 @@
 			"@mariozechner/pi": ["./packages/pods/src/index.ts"]
 		}
 	},
-	"include": ["packages/*/src/**/*", "packages/*/test/**/*"],
-	"exclude": ["packages/browser-extension/**/*"]
+	"include": ["packages/*/src/**/*", "packages/*/test/**/*"]
 }