Rename ChromeStorageBackend to WebExtensionStorageBackend for cross-browser support

- Rename chrome-storage-backend.ts to web-extension-storage-backend.ts
- Update to use globalThis.browser || globalThis.chrome for Firefox/Chrome compatibility
- Export both names for backward compatibility
- Fix tsc --preserveWatchOutput in web-ui dev script to prevent console clearing

This fixes the "browser is not defined" error in Chrome extensions.

pi-mono.code-workspace

@@ -1,13 +1,16 @@
 {
 	"folders": [
 		{
+			"name": "sitegeist",
+			"path": "../sitegeist"
+		},
+		{
+			"name": "pi-mono",
 			"path": "."
 		},
 		{
+			"name": "mini-lit",
 			"path": "../mini-lit"
-		},
-		{
-			"path": "../sitegeist"
 		}
 	],
 	"settings": {}