Fix cross-platform build: move macos-haptics permission to macOS-only capability

The macos-haptics:default permission was in the shared capability file,
causing builds to fail on Windows and Linux where the plugin isn't available.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ParthJadhav

src-tauri/capabilities/default.json

@@ -14,7 +14,7 @@
     "notification:allow-is-permission-granted",
     "notification:allow-request-permission",
     "notification:allow-notify",
-    "core:window:allow-start-dragging",
-    "macos-haptics:default"
-  ]
+    "core:window:allow-start-dragging"
+  ],
+  "platforms": ["linux", "macOS", "windows"]
 }

src-tauri/capabilities/macos.json

@@ -0,0 +1,9 @@
+{
+  "identifier": "macos-only",
+  "description": "macOS-specific capabilities",
+  "windows": ["main"],
+  "permissions": [
+    "macos-haptics:default"
+  ],
+  "platforms": ["macOS"]
+}