refactor(ui): extract repository tab bar into dedicated component

The complex logic and markup for rendering the repository tabs have been extracted from App.svelte into a new, reusable RepoTabs component. This refactoring significantly cleans up the main application view, improves separation of concerns, and makes the UI structure easier to maintain and extend. Corresponding CSS updates were applied to ensure the visual fidelity and responsiveness of the tab bar remain consistent across different states.

- Encapsulates all tab rendering logic in src/lib/RepoTabs.svelte
- Simplifies App.svelte by replacing large block of HTML with component usage
- Updates styling for better alignment and modern aesthetics

src/App.svelte

@@ -3,10 +3,11 @@
   import { invoke } from "@tauri-apps/api/core";
   import { open as openDialog } from "@tauri-apps/plugin-dialog";
   import { check, type DownloadEvent, type Update } from "@tauri-apps/plugin-updater";
-  import { AlertCircle, BookOpen, Cherry, Download, FolderOpen, GitBranch, GitMerge, LoaderCircle, Plus, Search, Star, X } from "@lucide/svelte";
+  import { AlertCircle, Cherry, Download, FolderOpen, GitBranch, GitMerge, LoaderCircle, Plus, Search, Star, X } from "@lucide/svelte";
 
   import TitleBar from "./lib/TitleBar.svelte";
   import RepoToolbar from "./lib/RepoToolbar.svelte";
+  import RepoTabs from "./lib/RepoTabs.svelte";
   import AiSettingsDialog from "./lib/components/AiSettingsDialog.svelte";
   import AnalyticsNoticeDialog from "./lib/components/AnalyticsNoticeDialog.svelte";
   import AppSettingsDialog from "./lib/components/AppSettingsDialog.svelte";
@@ -3537,65 +3538,18 @@
 
   <div class="shell-body">
 
-    <header class="repo-tabbar" aria-label="Repository tabs">
-      <button
-        class="repo-tab management"
-        class:active={activeView === "management"}
-        type="button"
-        onclick={openRepoManagement}
-        disabled={isBusy}
-        title="Repository Management"
-      >
-        <BookOpen size={14} aria-hidden="true" />
-        Repository Management
-      </button>
-
-      <div class="repo-tabs-scroll">
-        {#each repoTabs as repo (repo.path)}
-          <div
-            class="repo-tab-wrap"
-            class:active={activeView === "repository" && sameRepoPath(activeRepoPath, repo.path)}
-            role="presentation"
-            oncontextmenu={(event) => openRepoTabContextMenu(repo.path, event)}
-          >
-            <button
-              class="repo-tab"
-              type="button"
-              onclick={() => selectRepoTab(repo.path)}
-              disabled={isBusy}
-              title={repo.path}
-            >
-              <FolderOpen size={14} aria-hidden="true" />
-              <span>{repo.name}</span>
-              {#if repo.branch}
-                <strong>{repo.branch}</strong>
-              {/if}
-            </button>
-            <button
-              class="repo-tab-close"
-              type="button"
-              onclick={(event) => closeRepoTab(repo.path, event)}
-              disabled={isBusy}
-              aria-label={`Close ${repo.name}`}
-              title="Close repository tab"
-            >
-              <X size={13} aria-hidden="true" />
-            </button>
-          </div>
-        {/each}
-      </div>
-
-      <button
-        class="repo-tab-add"
-        type="button"
-        onclick={chooseRepositoryFolder}
-        disabled={isBusy}
-        title="Open repository folder"
-        aria-label="Open repository folder"
-      >
-        <Plus size={15} aria-hidden="true" />
-      </button>
-    </header>
+    <RepoTabs
+      {activeView}
+      {repoTabs}
+      {isBusy}
+      language={appLanguage}
+      onOpenManagement={openRepoManagement}
+      isActive={(path) => activeView === "repository" && sameRepoPath(activeRepoPath, path)}
+      onSelect={selectRepoTab}
+      onClose={closeRepoTab}
+      onContextMenu={openRepoTabContextMenu}
+      onAdd={chooseRepositoryFolder}
+    />
 
     <!-- Repo actions live under the tab bar and disappear in Repository
          Management, where none of them are applicable. -->