feat(desktop): Tauri mac shell around the web export

Black screen root cause: Tauri injects nonces into style-src, which
makes WebKit drop 'unsafe-inline' and block react-native-web's inline
style attributes. style-src is now excluded from CSP modification.
Window opens on the home screen so the section menu is reachable.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wmf3K9nCoEsXvvwkmMnuiM

desktop/src-tauri/tauri.conf.json

@@ -0,0 +1,48 @@
+{
+  "$schema": "https://schema.tauri.app/config/2",
+  "productName": "GTD",
+  "version": "1.0.0",
+  "identifier": "xyz.rehbock.gtd",
+  "build": {
+    "devUrl": "http://localhost:8081",
+    "beforeDevCommand": "scripts/dev-web.sh",
+    "beforeBuildCommand": "scripts/export-web.sh",
+    "frontendDist": "../../app/dist"
+  },
+  "app": {
+    "windows": [
+      {
+        "label": "main",
+        "title": "GTD",
+        "url": "index.html",
+        "width": 1100,
+        "height": 750,
+        "minWidth": 800,
+        "minHeight": 600,
+        "center": true
+      }
+    ],
+    "security": {
+      "dangerousDisableAssetCspModification": ["style-src"],
+      "csp": {
+        "default-src": "'self' tauri: asset: http://asset.localhost",
+        "script-src": "'self' 'unsafe-inline' 'unsafe-eval' tauri: asset: http://asset.localhost blob: data:",
+        "style-src": "'self' 'unsafe-inline' tauri: asset: http://asset.localhost blob: data:",
+        "img-src": "'self' tauri: asset: http://asset.localhost blob: data:",
+        "font-src": "'self' tauri: asset: http://asset.localhost blob: data:",
+        "connect-src": "'self' ipc: http://ipc.localhost tauri: asset: http://asset.localhost https://gtd.rehbock.xyz",
+        "media-src": "'self' tauri: asset: http://asset.localhost blob: data:"
+      }
+    }
+  },
+  "bundle": {
+    "active": true,
+    "targets": ["app", "dmg"],
+    "icon": ["icons/icon.icns", "icons/icon.ico", "icons/32x32.png", "icons/128x128.png", "icons/128x128@2x.png"],
+    "category": "Productivity",
+    "macOS": {
+      "minimumSystemVersion": "11.0",
+      "hardenedRuntime": true
+    }
+  }
+}