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/raw.js

@@ -198,7 +198,7 @@ export class RawViewer {
                 return `[${ts}] [${dir}] ${e.data}`;
             });
             const content = lines.join('\n');
-            await window.go.api.Service.SaveCapture(sessionId, content);
+            await window.go.api.Service.SaveSessionCapture(sessionId, content);
             this.app.notifications.success('Capture saved');
         } catch (err) {
             this.app.notifications.error('Save failed: ' + err);