security: define minimal frontend CSP

Replace the disabled Tauri CSP with explicit local IPC and API connectivity while retaining only required asset and inline-style allowances.

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Transcript",
-  "version": "0.1.0",
+  "version": "0.3.1",
   "identifier": "com.transcript.desktop",
   "build": {
     "beforeDevCommand": "npm run dev",
@@ -14,23 +14,38 @@
       {
         "title": "Transcript",
         "label": "main",
-        "width": 600,
-        "height": 560,
+        "width": 380,
+        "height": 460,
         "minWidth": 360,
-        "minHeight": 420,
-        "resizable": true,
+        "minHeight": 72,
+        "maxWidth": 820,
+        "maxHeight": 460,
+        "resizable": false,
+        "maximizable": false,
+        "minimizable": true,
+        "closable": true,
         "alwaysOnTop": true,
-        "visible": true
+        "visible": true,
+        "decorations": false,
+        "transparent": true,
+        "backgroundColor": "#00000000",
+        "shadow": false,
+        "dragDropEnabled": false,
+        "center": true
       }
     ],
     "security": {
-      "csp": null
+      "csp": "default-src 'self' ipc: http://ipc.localhost; connect-src 'self' ipc: http://ipc.localhost http://127.0.0.1:8000; img-src 'self' asset: https://asset.localhost data:; style-src 'self' 'unsafe-inline'; script-src 'self'"
     }
   },
   "bundle": {
     "active": true,
-    "targets": "all",
-    "icon": ["icons/icon.ico"],
-    "externalBin": ["binaries/sherpa-onnx-offline"]
+    "resources": ["resources/whisper/"],
+    "icon": [
+      "icons/32x32.png",
+      "icons/128x128.png",
+      "icons/[email protected]",
+      "icons/icon.ico"
+    ]
   }
 }