feat: move git toolbar to top bar with proper styling

- Move GitToolbar from sidebar to top bar below workspace header
- Remove GitToolbar from sidebar layout
- Add comprehensive CSS styles for git toolbar:
  - Flex layout with proper spacing
  - Styled buttons with hover effects
  - Branch selector styling
  - Badge styling for ahead/behind counts
  - Status badges for modified/added/deleted/untracked
  - Error message styling
  - New branch form styling
- Quality gates: typecheck ✓ lint ✓ build ✓

apps/web/src/pages/repo-workspace.tsx

@@ -172,48 +172,51 @@ export const RepoWorkspace = () => {
       )}
 
       {status === "ready" && repositories.length > 0 && (
-        <div className="workspace-layout">
-          <aside className="workspace-sidebar">
-            <div className="sidebar-section">
-              <label className="form-field">
-                Repository
-                <select
-                  value={selectedRepoId || ""}
-                  onChange={(e) => handleRepoChange(e.target.value)}
-                >
-                  {repositories.map((repo) => (
-                    <option key={repo.id} value={repo.id}>
-                      {repo.name}
-                    </option>
-                  ))}
-                </select>
-              </label>
-            </div>
+        <>
+          {selectedRepoId && (
+            <GitToolbar
+              projectId={projectId!}
+              repoId={selectedRepoId}
+              currentBranch={currentBranch}
+              branches={branches}
+              onBranchChange={(branch) => {
+                setCurrentBranch(branch);
+                const newParams = new URLSearchParams(searchParams);
+                newParams.set("branch", branch);
+                setSearchParams(newParams);
+              }}
+              onRefresh={() => {
+                void loadBranches();
+                void loadGitStatus();
+                window.dispatchEvent(new CustomEvent("refresh-file-tree"));
+              }}
+            />
+          )}
+          <div className="workspace-layout">
+            <aside className="workspace-sidebar">
+              <div className="sidebar-section">
+                <label className="form-field">
+                  Repository
+                  <select
+                    value={selectedRepoId || ""}
+                    onChange={(e) => handleRepoChange(e.target.value)}
+                  >
+                    {repositories.map((repo) => (
+                      <option key={repo.id} value={repo.id}>
+                        {repo.name}
+                      </option>
+                    ))}
+                  </select>
+                </label>
+              </div>
 
-            {selectedRepoId && (
-              <>
-                <GitToolbar
-                  projectId={projectId!}
-                  repoId={selectedRepoId}
-                  currentBranch={currentBranch}
-                  branches={branches}
-                  onBranchChange={(branch) => {
-                    setCurrentBranch(branch);
-                    const newParams = new URLSearchParams(searchParams);
-                    newParams.set("branch", branch);
-                    setSearchParams(newParams);
-                  }}
-                  onRefresh={() => {
-                    void loadBranches();
-                    void loadGitStatus();
-                    window.dispatchEvent(new CustomEvent("refresh-file-tree"));
-                  }}
-                />
-                <FileBrowser
-                  projectId={projectId!}
-                  repoId={selectedRepoId}
-                  gitStatus={gitStatus}
-                />
+              {selectedRepoId && (
+                <>
+                  <FileBrowser
+                    projectId={projectId!}
+                    repoId={selectedRepoId}
+                    gitStatus={gitStatus}
+                  />
                 {gitStatus && (
                   <CommitPanel
                     projectId={projectId!}
@@ -238,6 +241,7 @@ export const RepoWorkspace = () => {
             )}
           </main>
         </div>
+      </>
       )}
     </section>
   );