V2 Replace Google Fonts icons with locally bundled Iconify icons (#4283)

# Description of Changes

This PR refactors the frontend icon system to remove reliance on
@mui/icons-material and the Google Material Symbols webfont.

🔄 Changes

Introduced a new LocalIcon component powered by Iconify.
Added scripts/generate-icons.js to:
Scan the codebase for used icons.
Extract only required Material Symbols from
@iconify-json/material-symbols.
Generate a minimized JSON bundle and TypeScript types.
Updated .gitignore to exclude generated icon files.
Replaced all <span className="material-symbols-rounded"> and MUI icon
imports with <LocalIcon> usage.
Removed material-symbols CSS import and related font dependency.
Updated tsconfig.json to support JSON imports.
Added prebuild/predev hooks to auto-generate the icons.

✅ Benefits

No more 5MB+ Google webfont download → reduces initial page load size.
Smaller install footprint → no giant @mui/icons-material dependency.
Only ships the icons we actually use, cutting bundle size further.
Type-safe icons via auto-generated MaterialSymbolIcon union type.

Note most MUI not included in this update since they are low priority
due to small SVG sizing (don't grab whole bundle)


---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: a <a>

frontend/package.json

@@ -8,6 +8,7 @@
     "@atlaskit/pragmatic-drag-and-drop": "^1.7.4",
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.0",
+    "@iconify/react": "^6.0.0",
     "@mantine/core": "^8.0.1",
     "@mantine/dropzone": "^8.0.1",
     "@mantine/hooks": "^8.0.1",
@@ -25,7 +26,6 @@
     "i18next-browser-languagedetector": "^8.1.0",
     "i18next-http-backend": "^3.0.2",
     "jszip": "^3.10.1",
-    "material-symbols": "^0.33.0",
     "pdf-lib": "^1.17.1",
     "pdfjs-dist": "^3.11.174",
     "react": "^19.1.0",
@@ -36,10 +36,14 @@
     "web-vitals": "^2.1.4"
   },
   "scripts": {
+    "predev": "npm run generate-icons",
     "dev": "npx tsc --noEmit && vite",
+    "prebuild": "npm run generate-icons",
     "build": "npx tsc --noEmit && vite build",
     "preview": "vite preview",
     "generate-licenses": "node scripts/generate-licenses.js",
+    "generate-icons": "node scripts/generate-icons.js",
+    "generate-icons:verbose": "node scripts/generate-icons.js --verbose",
     "test": "vitest",
     "test:watch": "vitest --watch",
     "test:coverage": "vitest --coverage",
@@ -66,6 +70,8 @@
     ]
   },
   "devDependencies": {
+    "@iconify-json/material-symbols": "^1.2.33",
+    "@iconify/utils": "^3.0.1",
     "@playwright/test": "^1.40.0",
     "@types/node": "^24.2.1",
     "@types/react": "^19.1.4",