M10.2: Tauri v2 desktop scaffold (desktop/) — Vue frontend as the webview

New desktop/ Tauri v2 project (Linux-first, cross-platform-ready):
- src-tauri: Cargo.toml (lib + thin main.rs shim), build.rs, lib.rs (Builder
  entry point), tauri.conf.json (frontendDist -> ../../frontend/dist, devUrl
  :5173, deb+appimage bundles), capabilities/default.json (core:default),
  .gitignore.
- The shared Vue 3 frontend is the sibling ../frontend; before-commands cd via
  "$(git rev-parse --show-toplevel)/frontend" since frontend and src-tauri are
  siblings, not nested.
- Icons generated from frontend/public/icon.svg via `cargo tauri icon` in CI
  (M10.8), not committed.

Boots the shared UI in a native window. The local data adapter (M10.3/M10.5)
and CI build verification (M10.8) follow. desktop/** is not yet in the CI paths
filter — added with the desktop lane in M10.8.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm

desktop/src-tauri/tauri.conf.json

@@ -0,0 +1,43 @@
+{
+  "$schema": "https://schema.tauri.app/config/2",
+  "productName": "ThoughtSync",
+  "version": "0.1.0",
+  "identifier": "com.fabledsword.thoughtsync",
+  "build": {
+    "frontendDist": "../../frontend/dist",
+    "devUrl": "http://localhost:5173",
+    "beforeDevCommand": "cd \"$(git rev-parse --show-toplevel)/frontend\" && npm run dev",
+    "beforeBuildCommand": "cd \"$(git rev-parse --show-toplevel)/frontend\" && npm ci && npm run build"
+  },
+  "app": {
+    "windows": [
+      {
+        "label": "main",
+        "title": "ThoughtSync",
+        "width": 1100,
+        "height": 780,
+        "minWidth": 480,
+        "minHeight": 600,
+        "resizable": true,
+        "center": true
+      }
+    ],
+    "security": {
+      "csp": null
+    }
+  },
+  "bundle": {
+    "active": true,
+    "targets": ["deb", "appimage"],
+    "category": "Utility",
+    "shortDescription": "Local-first Keep-style thought capture.",
+    "longDescription": "ThoughtSync captures a fleeting thought in a second on a Keep-style board and grows into a lightweight second brain. Local-first: works fully offline on an on-device store, and optionally syncs to your self-hosted ThoughtSync server.",
+    "icon": [
+      "icons/32x32.png",
+      "icons/128x128.png",
+      "icons/128x128@2x.png",
+      "icons/icon.icns",
+      "icons/icon.ico"
+    ]
+  }
+}