Phase 0.2: migrate UI component SVGs to lucide-react

- Button.tsx: Loader2 spinner
- EmptyState.tsx: FolderOpen default icon
- Modal.tsx: X close icon
- Pagination.tsx: ChevronLeft/ChevronRight
- Table.tsx: Loader2 loading spinner
- Toast.tsx: Check/X/AlertTriangle/Info + X close
- lucide-react v1.25.0 installed
- All 85 UI tests pass
- 2 pre-existing TSC errors in Dms.tsx (unrelated)

frontend/package-lock.json

@@ -25,6 +25,7 @@
         "clsx": "^2.1.1",
         "i18next": "^23.14.0",
         "i18next-browser-languagedetector": "^8.0.0",
+        "lucide-react": "^1.25.0",
         "react": "^18.3.1",
         "react-dom": "^18.3.1",
         "react-hook-form": "^7.53.0",
@@ -3854,6 +3855,14 @@
         "yallist": "^3.0.2"
       }
     },
+    "node_modules/lucide-react": {
+      "version": "1.25.0",
+      "resolved": "https://registry.npmjs.org/lucide-react/-/lucide-react-1.25.0.tgz",
+      "integrity": "sha512-/mdJTRbiwcLOQ1NZZK1amZF9rIZyvO18D6r9TngE6TG1NmqHgFuT4eE7Xrkm9UsXMbBJD1NlfwHVltCDWHrOTw==",
+      "peerDependencies": {
+        "react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/lz-string": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/lz-string/-/lz-string-1.5.0.tgz",