feat: add JSON editor for config

- Add a JSON editor using Monaco Editor to allow raw editing of the configuration.
- The editor is presented as a full-screen dialog that slides up from the bottom.
- Includes 'Save' and 'Save and Restart' functionality with internationalized labels and toast notifications for success/failure.

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

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

ui/pnpm-lock.yaml

@@ -8,6 +8,9 @@ importers:
 
   .:
     dependencies:
+      '@monaco-editor/react':
+        specifier: ^4.7.0
+        version: 4.7.0(monaco-editor@0.52.2)(react-dom@19.1.0(react@19.1.0))(react@19.1.0)
       '@radix-ui/react-dialog':
         specifier: ^1.1.14
         version: 1.1.14(@types/react-dom@19.1.6(@types/react@19.1.8))(@types/react@19.1.8)(react-dom@19.1.0(react@19.1.0))(react@19.1.0)
@@ -461,6 +464,16 @@ packages:
   '@jridgewell/trace-mapping@0.3.29':
     resolution: {integrity: sha512-uw6guiW/gcAGPDhLmd77/6lW8QLeiV5RUTsAX46Db6oLhGaVj4lhnPwb184s1bkc8kdVg/+h988dro8GRDpmYQ==}
 
+  '@monaco-editor/loader@1.5.0':
+    resolution: {integrity: sha512-hKoGSM+7aAc7eRTRjpqAZucPmoNOC4UUbknb/VNoTkEIkCPhqV8LfbsgM1webRM7S/z21eHEx9Fkwx8Z/C/+Xw==}
+
+  '@monaco-editor/react@4.7.0':
+    resolution: {integrity: sha512-cyzXQCtO47ydzxpQtCGSQGOC8Gk3ZUeBXFAxD+CWXYFo5OqZyZUonFl0DwUlTyAfRHntBfw2p3w4s9R6oe1eCA==}
+    peerDependencies:
+      monaco-editor: '>= 0.25.0 < 1'
+      react: ^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0
+      react-dom: ^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0
+
   '@nodelib/fs.scandir@2.1.5':
     resolution: {integrity: sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==}
     engines: {node: '>= 8'}
@@ -1499,6 +1512,9 @@ packages:
     engines: {node: '>=10'}
     hasBin: true
 
+  monaco-editor@0.52.2:
+    resolution: {integrity: sha512-GEQWEZmfkOGLdd3XK8ryrfWz3AIP8YymVXiPHEdewrUq7mh0qrKrfHLNCXcbB6sTnMLnOZ3ztSiKcciFUkIJwQ==}
+
   ms@2.1.3:
     resolution: {integrity: sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==}
 
@@ -1689,6 +1705,9 @@ packages:
     resolution: {integrity: sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==}
     engines: {node: '>=0.10.0'}
 
+  state-local@1.0.7:
+    resolution: {integrity: sha512-HTEHMNieakEnoe33shBYcZ7NX83ACUjCu8c40iOGEZsngj9zRnkqS9j1pqQPXwobB0ZcVTk27REb7COQ0UR59w==}
+
   strip-json-comments@3.1.1:
     resolution: {integrity: sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==}
     engines: {node: '>=8'}
@@ -2153,6 +2172,17 @@ snapshots:
       '@jridgewell/resolve-uri': 3.1.2
       '@jridgewell/sourcemap-codec': 1.5.4
 
+  '@monaco-editor/loader@1.5.0':
+    dependencies:
+      state-local: 1.0.7
+
+  '@monaco-editor/react@4.7.0(monaco-editor@0.52.2)(react-dom@19.1.0(react@19.1.0))(react@19.1.0)':
+    dependencies:
+      '@monaco-editor/loader': 1.5.0
+      monaco-editor: 0.52.2
+      react: 19.1.0
+      react-dom: 19.1.0(react@19.1.0)
+
   '@nodelib/fs.scandir@2.1.5':
     dependencies:
       '@nodelib/fs.stat': 2.0.5
@@ -3135,6 +3165,8 @@ snapshots:
 
   mkdirp@3.0.1: {}
 
+  monaco-editor@0.52.2: {}
+
   ms@2.1.3: {}
 
   nanoid@3.3.11: {}
@@ -3300,6 +3332,8 @@ snapshots:
 
   source-map-js@1.2.1: {}
 
+  state-local@1.0.7: {}
+
   strip-json-comments@3.1.1: {}
 
   supports-color@7.2.0: