fix(build): add post-build script to fix HTML paths for Chrome extension

- Create scripts/fix-build-paths.js to convert absolute paths to relative
- Update build script to run fix-build-paths.js after plasmo build
- Add build:raw script for raw plasmo build without fix

Problem: Plasmo generates HTML with absolute paths (href="/file.css")
which causes ERR_FILE_NOT_FOUND in Chrome extensions.

Solution: Post-build script replaces /path with ./path

surfsense_browser_extension/package.json

@@ -21,7 +21,8 @@
 	},
 	"scripts": {
 		"dev": "plasmo dev",
-		"build": "plasmo build",
+		"build": "plasmo build && node scripts/fix-build-paths.js",
+		"build:raw": "plasmo build",
 		"package": "plasmo package"
 	},
 	"dependencies": {