fix: use Tauri clipboard plugin for reliable share links

- Add tauri-plugin-clipboard-manager for reliable clipboard access
- Replace browser clipboard API with Tauri plugin
- Improve error messages in share functions to be more specific
- Add loading indicator for Song.link fetch

src-tauri/Cargo.toml

@@ -73,3 +73,6 @@ dotenvy = "0.15"
 
 # Secure credential storage (system keyring)
 keyring = "3"
+
+# Clipboard
+tauri-plugin-clipboard-manager = "2"

src-tauri/capabilities/default.json

@@ -6,6 +6,7 @@
   "permissions": [
     "core:default",
     "opener:default",
-    "dialog:default"
+    "dialog:default",
+    "clipboard-manager:default"
   ]
 }

src-tauri/src/lib.rs

@@ -97,6 +97,7 @@ pub fn run() {
     tauri::Builder::default()
         .plugin(tauri_plugin_opener::init())
         .plugin(tauri_plugin_dialog::init())
+        .plugin(tauri_plugin_clipboard_manager::init())
         .manage(AppState::new())
         .manage(library_state)
         .invoke_handler(tauri::generate_handler![