Add native media save dialog and bump cinny submodule.

Wire Electron/Tauri save-file IPC for desktop downloads and update the cinny submodule with username colors, release notes, and account profile layout fixes.

src-tauri/capabilities/default.json

@@ -18,6 +18,17 @@
     "updater:allow-download",
     "updater:allow-download-and-install",
     "dialog:default",
+    "fs:default",
+    "fs:allow-write-file",
+    {
+      "identifier": "fs:scope",
+      "allow": [
+        { "path": "$HOME/**" },
+        { "path": "$DOWNLOAD/**" },
+        { "path": "$DESKTOP/**" },
+        { "path": "$DOCUMENT/**" }
+      ]
+    },
     "process:allow-restart",
     {
       "identifier": "http:default",