refactor(repo-toolbar): use single openMenu state for menus

Consolidates the previous historyOpen and syncOpen booleans into a single
union-typed openMenu ("history" | "sync" | null). Menu toggles, outside-click
handler, Escape key handling and menu-item clicks now set/clear openMenu,
and aria-expanded / class bindings were updated to reference openMenu.

No user-facing behavior changes intended beyond ensuring only one menu can be
open at a time and simplifying the event-handling logic.

src/lib/RepoToolbar.svelte

@@ -49,8 +49,7 @@
   export let onOpenSubmodules: () => void = () => {};
   export let onOpenLfs: () => void = () => {};
 
-  let historyOpen = false;
-  let syncOpen = false;
+  let openMenu: "history" | "sync" | null = null;
   let toolbarElement: HTMLDivElement;
 
   $: isGerman = language === "de";
@@ -65,18 +64,18 @@
     : "Push";
 
   function runHistoryAction(action: () => void) {
-    historyOpen = false;
+    openMenu = null;
     action();
   }
 
   function handleWindowClick(event: MouseEvent) {
-    if (toolbarElement && !toolbarElement.contains(event.target as Node)) { historyOpen = false; syncOpen = false; }
+    if (toolbarElement && !toolbarElement.contains(event.target as Node)) openMenu = null;
   }
 
   function handleWindowKeydown(event: KeyboardEvent) {
-    if (event.key === "Escape" && historyOpen) {
+    if (event.key === "Escape" && openMenu) {
       event.stopPropagation();
-      historyOpen = false;
+      openMenu = null;
     }
   }
 </script>
@@ -144,15 +143,15 @@
         {/if}
       </button>
       <div class="repo-history-wrap">
-        <button class="repo-action" type="button" onclick={() => { syncOpen = !syncOpen; historyOpen = false; }} disabled={!hasRepository || isBusy} aria-label={isGerman ? "Sync-Optionen" : "Sync options"} aria-haspopup="menu">
+        <button class="repo-action" type="button" onclick={() => { openMenu = openMenu === "sync" ? null : "sync"; }} disabled={!hasRepository || isBusy} aria-label={isGerman ? "Sync-Optionen" : "Sync options"} aria-haspopup="menu" aria-expanded={openMenu === "sync"}>
           <ChevronDown size={14} aria-hidden="true" />
         </button>
-        {#if syncOpen}
+        {#if openMenu === "sync"}
           <div class="repo-history-menu" role="menu">
-            <button type="button" role="menuitem" onclick={() => { syncOpen = false; onFetchPrune(); }}><CloudDownload size={15} /><span><strong>Fetch + Prune</strong><small>{isGerman ? "Veraltete Remote-Branches entfernen" : "Remove stale remote branches"}</small></span></button>
-            <button type="button" role="menuitem" onclick={() => { syncOpen = false; onForcePush(); }}><Upload size={15} /><span><strong>Force with lease</strong><small>{isGerman ? "Sicheres Pushen nach Rebase" : "Safe push after rebase"}</small></span></button>
-            <button type="button" role="menuitem" onclick={() => { syncOpen = false; onSyncOptions(); }}><Settings2 size={15} /><span><strong>{isGerman ? "Remotes & Strategien" : "Remotes & strategies"}</strong><small>{isGerman ? "Upstream, Pull und Remote verwalten" : "Manage upstream, pull and remotes"}</small></span></button>
-            <button type="button" role="menuitem" onclick={() => { syncOpen = false; onOpenLfs(); }}><Box size={15} /><span><strong>Git LFS</strong><small>{isGerman ? "Große Dateien und LFS-Installation verwalten" : "Manage large files and LFS installation"}</small></span></button>
+            <button type="button" role="menuitem" onclick={() => { openMenu = null; onFetchPrune(); }}><CloudDownload size={15} /><span><strong>Fetch + Prune</strong><small>{isGerman ? "Veraltete Remote-Branches entfernen" : "Remove stale remote branches"}</small></span></button>
+            <button type="button" role="menuitem" onclick={() => { openMenu = null; onForcePush(); }}><Upload size={15} /><span><strong>Force with lease</strong><small>{isGerman ? "Sicheres Pushen nach Rebase" : "Safe push after rebase"}</small></span></button>
+            <button type="button" role="menuitem" onclick={() => { openMenu = null; onSyncOptions(); }}><Settings2 size={15} /><span><strong>{isGerman ? "Remotes & Strategien" : "Remotes & strategies"}</strong><small>{isGerman ? "Upstream, Pull und Remote verwalten" : "Manage upstream, pull and remotes"}</small></span></button>
+            <button type="button" role="menuitem" onclick={() => { openMenu = null; onOpenLfs(); }}><Box size={15} /><span><strong>Git LFS</strong><small>{isGerman ? "Große Dateien und LFS-Installation verwalten" : "Manage large files and LFS installation"}</small></span></button>
           </div>
         {/if}
       </div>
@@ -187,12 +186,12 @@
     <div class="repo-history-wrap">
       <button
         class="repo-action history-trigger"
-        class:active={historyOpen}
+        class:active={openMenu === "history"}
         type="button"
-        onclick={() => { historyOpen = !historyOpen; }}
+        onclick={() => { openMenu = openMenu === "history" ? null : "history"; }}
         disabled={!hasRepository || isBusy}
         aria-haspopup="menu"
-        aria-expanded={historyOpen}
+        aria-expanded={openMenu === "history"}
         title={isGerman ? "Verlauf und Rebase" : "History and rebase"}
       >
         <History size={15} aria-hidden="true" />
@@ -200,7 +199,7 @@
         <ChevronDown class="history-chevron" size={13} aria-hidden="true" />
       </button>
 
-      {#if historyOpen}
+      {#if openMenu === "history"}
         <div class="repo-history-menu" role="menu">
           <button type="button" role="menuitem" onclick={() => runHistoryAction(onReflog)}>
             <History size={15} aria-hidden="true" />