Fix frontend: remove Wails script tags, fix API mismatches, fix status bar

- Remove explicit /wails/ipc.js and /wails/runtime.js script tags from
  index.html (Wails v2 auto-injects its runtime, explicit tags cause 404s
  that block window.runtime and window.go from loading)
- Fix SecretStoreStatus() → IsSecretStoreInitialised() + IsSecretStoreUnlocked()
- Fix Connect() → ConnectSession()
- Fix QuickConnect(proto, host, port) → ConnectQuick(profileObject)
- Fix ImportProfilesDialog()/ExportProfilesDialog() → SelectFile/ExportProfiles/SaveFile
- Fix CloseSession() → DisconnectSession()
- Fix TestConnection() → show notification (method doesn't exist in backend)
- Fix SaveCapture() → SaveSessionCapture()
- Fix updateStatusBar() to use existing #status-connection, #status-session-count,
  and #status-vault spans instead of replacing the entire status bar innerHTML

frontend/src/js/profiles.js

@@ -834,17 +834,7 @@ export class ProfileEditor {
             return;
         }
 
-        this.app.notifications.info('Testing connection…');
-        try {
-            const result = await window.go.api.Service.TestConnection(this._profile);
-            if (result && result.success) {
-                this.app.notifications.success('Connection successful!');
-            } else {
-                this.app.notifications.error('Connection failed: ' + (result?.error || 'Unknown error'));
-            }
-        } catch (err) {
-            this.app.notifications.error('Test failed: ' + err);
-        }
+        this.app.notifications.info('Test connection is not yet available.');
     }
 
     // ── Utilities ────────────────────────────────────────────────────