fix: keep command-line debug session-only

frontend/src/App.svelte

@@ -219,7 +219,7 @@
       const settings = await App.GetAppSettings();
       debug.log('[App] checkVault: GetAppSettings returned', settings);
       flog('checkVault: GetAppSettings returned');
-      if (settings?.debug) debug.enable();
+      if (settings?.debug) debug.enable({ persist: false });
 
       debug.log('[App] checkVault: calling GetVaultStatus...');
       vaultStatus = await App.GetVaultStatus() || { status: 'unknown', path: '', vaultId: '' };

frontend/src/lib/log/debug.js

@@ -127,9 +127,11 @@ export var debug = {
   log: log,
   logf: logf,
   isEnabled: function () { return ENABLED; },
-  enable: function () {
+  enable: function (options) {
     ENABLED = true;
-    try { localStorage.setItem('verstak-debug', 'true'); } catch (e) {}
+    if (!options || options.persist !== false) {
+      try { localStorage.setItem('verstak-debug', 'true'); } catch (e) {}
+    }
   },
   disable: function () {
     ENABLED = false;