fix(staged): fix variable-used-before-assignment in getBranchTimeline

Use definite assignment assertion for self-referencing promise variable.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: matt2e

apps/staged/src/lib/commands.ts

@@ -405,7 +405,8 @@ export function getBranchTimeline(
   // Use cachedInvoke so IndexedDB serves data on cold start while the network
   // fetch runs in parallel (SWR). The first yield may be cached; the last is
   // always the freshest available value.
-  const request = (async () => {
+  let request!: Promise<BranchTimeline>;
+  request = (async () => {
     let timeline: BranchTimeline | undefined;
     for await (const { data } of cachedInvoke<BranchTimeline>(
       'get_branch_timeline',