fix(accounts): isolate action menu interactions

Stop double-click events on account action buttons before they reach editable table rows. Simplify the account menu heading to a single hoster and access-type label without empty identity separators, and cover both interaction and formatting paths.

src/renderer/App.tsx

@@ -114,6 +114,7 @@ import {
   projectAccountRows,
   resolveHistoryRetentionSelection,
   sortAccountRows,
+  formatAccountContextHeading,
   type AccountAddOption,
   type AccountRowSource,
   type SettingsFormViewModel,
@@ -5982,8 +5983,7 @@ export function App(): ReactElement {
           y={accountContextMenu.y}
         >
           <div className="account-context-heading">
-            <strong>{activeAccountContextRow.hosterLabel}</strong>
-            <span>{activeAccountContextRow.modeLabel} · {activeAccountContextRow.username}</span>
+            <strong>{formatAccountContextHeading(activeAccountContextRow.hosterLabel, activeAccountContextRow.modeLabel)}</strong>
           </div>
           <div className="ctx-menu-sep" />
           <button className="ctx-menu-item" onClick={() => { setAccountContextMenu(null); openEditAccountDialog(activeAccountContextRow); }}>

src/renderer/views/settings/AccountWorkspace.tsx

@@ -356,13 +356,14 @@ function AccountRow({
           aria-label={`${row.hoster} Aktionen`}
           className="settings-account-action-button"
           disabled={busy}
-          onClick={(event) => {
-            event.stopPropagation();
-            const rect = event.currentTarget.getBoundingClientRect();
-            actions.onContextMenu(row.id, rect.right, rect.bottom);
-          }}
-          type="button"
-        >⋯</button>
+          onClick={(event) => {
+            event.stopPropagation();
+            const rect = event.currentTarget.getBoundingClientRect();
+            actions.onContextMenu(row.id, rect.right, rect.bottom);
+          }}
+          onDoubleClick={(event) => event.stopPropagation()}
+          type="button"
+        >⋯</button>
       </span>
     </div>
   );

src/renderer/views/settings/settings-model.ts

@@ -72,6 +72,10 @@ export function getAccountTableMinWidth(widths: AccountTableColumnWidths): numbe
   return 42 + 64 + ACCOUNT_TABLE_COLUMN_IDS.reduce((sum, id) => sum + widths[id], 0);
 }
 
+export function formatAccountContextHeading(hoster: string, mode: string): string {
+  return `${hoster} | ${mode}`;
+}
+
 export function getSettingsSaveLabel(state: SettingsSaveState): string {
   switch (state) {
     case "dirty":