feat(git): expand core git repository management features

This update significantly expands the available Git functionality by adding robust support for initializing repositories, managing remotes, and improving complex workflow operations like merging and reverting commits. New API endpoints are exposed across the backend and frontend to handle remote setup, branch tracking, and conflict resolution workflows.

- Added full remote management capabilities (add, update, remove).
- Implemented advanced merge strategies and commit reversion logic.
- Introduced a dedicated UI component for synchronization settings.

src/lib/RepoToolbar.svelte

@@ -11,6 +11,7 @@
     RefreshCw,
     Search,
     Upload,
+    Settings2,
   } from "@lucide/svelte";
 
   export let hasRepository: boolean = false;
@@ -28,8 +29,12 @@
   export let onInteractiveRebase: () => void = () => {};
   export let onReflog: () => void = () => {};
   export let onOpenInExplorer: () => void = () => {};
+  export let onFetchPrune: () => void = () => {};
+  export let onForcePush: () => void = () => {};
+  export let onSyncOptions: () => void = () => {};
 
   let historyOpen = false;
+  let syncOpen = false;
   let toolbarElement: HTMLDivElement;
 
   $: isGerman = language === "de";
@@ -40,9 +45,7 @@
   }
 
   function handleWindowClick(event: MouseEvent) {
-    if (historyOpen && toolbarElement && !toolbarElement.contains(event.target as Node)) {
-      historyOpen = false;
-    }
+    if (toolbarElement && !toolbarElement.contains(event.target as Node)) { historyOpen = false; syncOpen = false; }
   }
 
   function handleWindowKeydown(event: KeyboardEvent) {
@@ -108,6 +111,18 @@
         <span class="repo-action-label">Push</span>
         {#if ahead > 0}<span class="repo-action-count ahead">↑{ahead}</span>{/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">
+          <ChevronDown size={14} aria-hidden="true" />
+        </button>
+        {#if syncOpen}
+          <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>
+          </div>
+        {/if}
+      </div>
     </div>
   </div>