feat(app,server): rank new-workspace picker by recency with debounced search

Plumb updatedAt through GitHub issue/PR search and committerDate through
branch suggestions so the new-workspace picker interleaves branches and
PRs sorted by last activity. Debounce the search query so remote GitHub
searches are driven by what the user typed rather than a static list.

packages/server/src/utils/checkout-git.test.ts

@@ -765,12 +765,21 @@ const x = 1;
     execSync("git fetch origin", { cwd: repoDir });
 
     const branches = await listBranchSuggestions(repoDir, { limit: 50 });
-    expect(branches).toContain("main");
-    expect(branches).toContain("local-only");
-    expect(branches).toContain("remote-only");
-    expect(branches.filter((name) => name === "main")).toHaveLength(1);
-    expect(branches).not.toContain("HEAD");
-    expect(branches.some((name) => name.startsWith("origin/"))).toBe(false);
+    const branchNames = branches.map((branch) => branch.name);
+    expect(branchNames).toContain("main");
+    expect(branchNames).toContain("local-only");
+    expect(branchNames).toContain("remote-only");
+    expect(branchNames.filter((name) => name === "main")).toHaveLength(1);
+    expect(branchNames).not.toContain("HEAD");
+    expect(branchNames.some((name) => name.startsWith("origin/"))).toBe(false);
+    expect(branches).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          name: "main",
+          committerDate: expect.any(Number),
+        }),
+      ]),
+    );
   });
 
   it("filters branch suggestions by query and enforces result limit", async () => {
@@ -786,7 +795,8 @@ const x = 1;
       limit: 1,
     });
     expect(branches).toHaveLength(1);
-    expect(branches[0]?.toLowerCase()).toContain("feature/");
+    expect(branches[0]?.name.toLowerCase()).toContain("feature/");
+    expect(branches[0]?.committerDate).toEqual(expect.any(Number));
   });
 
   it("disables GitHub features when gh is unavailable", async () => {
@@ -816,6 +826,7 @@ const x = 1;
           state: "OPEN",
           body: "issue body",
           labels: ["bug"],
+          updatedAt: "2026-04-18T12:00:00Z",
         },
       ];
     };
@@ -832,6 +843,7 @@ const x = 1;
           baseRefName: "main",
           headRefName: "feature",
           labels: ["enhancement"],
+          updatedAt: "2026-04-18T13:00:00Z",
         },
       ];
     };
@@ -853,6 +865,7 @@ const x = 1;
           labels: ["bug"],
           baseRefName: null,
           headRefName: null,
+          updatedAt: "2026-04-18T12:00:00Z",
         },
         {
           kind: "pr",
@@ -864,6 +877,7 @@ const x = 1;
           labels: ["enhancement"],
           baseRefName: "main",
           headRefName: "feature",
+          updatedAt: "2026-04-18T13:00:00Z",
         },
       ],
     });
@@ -890,6 +904,7 @@ const x = 1;
           baseRefName: "main",
           headRefName: "feature",
           labels: ["enhancement"],
+          updatedAt: "2026-04-18T13:00:00Z",
         },
       ];
     };
@@ -913,6 +928,7 @@ const x = 1;
           labels: ["enhancement"],
           baseRefName: "main",
           headRefName: "feature",
+          updatedAt: "2026-04-18T13:00:00Z",
         },
       ],
     });

packages/server/src/utils/checkout-git.ts

@@ -128,6 +128,11 @@ interface GitRef {
   committerDate: number;
 }
 
+export interface BranchSuggestion {
+  name: string;
+  committerDate: number;
+}
+
 async function listGitRefs(cwd: string, refPrefix: string): Promise<GitRef[]> {
   const { stdout } = await runGitCommand(
     [
@@ -181,7 +186,7 @@ function sortBranchSuggestions(
 export async function listBranchSuggestions(
   cwd: string,
   options?: { query?: string; limit?: number },
-): Promise<string[]> {
+): Promise<BranchSuggestion[]> {
   await requireGitRepo(cwd);
 
   const requestedLimit = options?.limit ?? 50;
@@ -227,7 +232,10 @@ export async function listBranchSuggestions(
   }
 
   const ordered = sortBranchSuggestions(filteredNames, branchMeta, query);
-  return ordered.slice(0, limit);
+  return ordered.slice(0, limit).map((name) => ({
+    name,
+    committerDate: branchMeta.get(name)?.committerDate ?? 0,
+  }));
 }
 
 async function listCheckoutFileChanges(
@@ -1936,6 +1944,7 @@ export interface GitHubSearchResult {
     labels: string[];
     baseRefName?: string | null;
     headRefName?: string | null;
+    updatedAt?: string;
   }>;
   githubFeaturesEnabled: boolean;
 }
@@ -1997,6 +2006,7 @@ export async function searchGitHubIssuesAndPrs(
           labels: item.labels,
           baseRefName: null,
           headRefName: null,
+          updatedAt: item.updatedAt,
         });
       }
     }
@@ -2013,6 +2023,7 @@ export async function searchGitHubIssuesAndPrs(
           labels: item.labels,
           baseRefName: item.baseRefName,
           headRefName: item.headRefName,
+          updatedAt: item.updatedAt,
         });
       }
     }