fix(extension): resolve build error - fix file encoding and JSX config

- Fix escaped quotes in ThreadGeneratorPanel.tsx (root cause of build error)
- Update tsconfig.json to use jsx: react-jsx instead of preserve
- Upgrade Plasmo to v0.90.5 (latest version)
- Build now succeeds in 4.7s

Root Cause: ThreadGeneratorPanel.tsx had escaped quotes (\") instead of
normal quotes ("), causing SWC parser to fail with 'Unexpected token div' error.
This was a file encoding issue, not a Plasmo version issue.

Fixes #build-error

surfsense_browser_extension/package.json

@@ -39,7 +39,6 @@
 		"dom-to-semantic-markdown": "^1.2.11",
 		"linkedom": "0.1.34",
 		"lucide-react": "^0.454.0",
-		"plasmo": "0.90.5",
 		"postcss-loader": "^8.1.1",
 		"radix-ui": "^1.0.1",
 		"react": "18.2.0",
@@ -57,6 +56,7 @@
 		"@types/react": "18.2.48",
 		"@types/react-dom": "18.2.18",
 		"autoprefixer": "^10.4.20",
+		"plasmo": "0.90.5",
 		"postcss": "^8.4.41",
 		"tailwindcss": "^3.4.10",
 		"typescript": "5.3.3"