Skip AppImage and RPM builds to avoid slow 360MB+ compression

AppImage bundler compresses the entire sidecar.zip into squashfs,
causing builds to hang/timeout. Limit targets to deb (Linux),
nsis+msi (Windows), and dmg (macOS).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src-tauri/tauri.conf.json

@@ -31,7 +31,7 @@
   },
   "bundle": {
     "active": true,
-    "targets": "all",
+    "targets": ["deb", "nsis", "msi", "dmg"],
     "icon": [
       "icons/32x32.png",
       "icons/128x128.png",
@@ -48,9 +48,6 @@
     "linux": {
       "deb": {
         "depends": []
-      },
-      "appimage": {
-        "bundleMediaFramework": true
       }
     },
     "windows": {