feat(frontend): Implement notification settings with separate drawers and improved design.

- Add shadcn/ui drawer and switch components
- Create NotificationFiltersDrawer for editing notification filters
- Create DiscordConfigDrawer with test functionality
- Create TelegramConfigDrawer with test functionality
- Add reusable EditButton component for consistent design language
- Refactor Settings page to use separate drawers per configuration type
- Remove test notifications card, integrate testing into service drawers
- Simplify notification service status indicators for cleaner UI
- Remove redundant service descriptions for streamlined layout

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/package-lock.json

@@ -22,6 +22,7 @@
         "@radix-ui/react-select": "^2.2.6",
         "@radix-ui/react-separator": "^1.1.7",
         "@radix-ui/react-slot": "^1.2.3",
+        "@radix-ui/react-switch": "^1.2.6",
         "@radix-ui/react-tabs": "^1.1.13",
         "@radix-ui/react-toggle": "^1.1.10",
         "@radix-ui/react-toggle-group": "^1.1.11",
@@ -4195,6 +4196,35 @@
         }
       }
     },
+    "node_modules/@radix-ui/react-switch": {
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/@radix-ui/react-switch/-/react-switch-1.2.6.tgz",
+      "integrity": "sha512-bByzr1+ep1zk4VubeEVViV592vu2lHE2BZY5OnzehZqOOgogN80+mNtCqPkhn2gklJqOpxWgPoYTSnhBCqpOXQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@radix-ui/primitive": "1.1.3",
+        "@radix-ui/react-compose-refs": "1.1.2",
+        "@radix-ui/react-context": "1.1.2",
+        "@radix-ui/react-primitive": "2.1.3",
+        "@radix-ui/react-use-controllable-state": "1.2.2",
+        "@radix-ui/react-use-previous": "1.1.1",
+        "@radix-ui/react-use-size": "1.1.1"
+      },
+      "peerDependencies": {
+        "@types/react": "*",
+        "@types/react-dom": "*",
+        "react": "^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc",
+        "react-dom": "^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        },
+        "@types/react-dom": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@radix-ui/react-tabs": {
       "version": "1.1.13",
       "resolved": "https://registry.npmjs.org/@radix-ui/react-tabs/-/react-tabs-1.1.13.tgz",