fix: use dynamic branch references instead of hardcoded origin/main

- Fix handleResolveConflicts to use origin/${worktree.branch} instead of
  hardcoded origin/main for pull and resolve conflicts
- Add defaultBaseBranch prop to CreatePRDialog to use selected branch
- Fix branchCardCounts to use primary worktree branch as default
- Enable PR status and Address PR Comments for main branch tab
- Add automatic PR detection from GitHub for branches without stored metadata

This allows users working on release branches (like v0.11.0rc) to properly
pull from their branch's remote and see PR status for any branch.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/server/src/routes/worktree/routes/list.ts

@@ -13,7 +13,7 @@ import { promisify } from 'util';
 import path from 'path';
 import * as secureFs from '../../../lib/secure-fs.js';
 import { isGitRepo } from '@automaker/git-utils';
-import { getErrorMessage, logError, normalizePath } from '../common.js';
+import { getErrorMessage, logError, normalizePath, execEnv, isGhCliAvailable } from '../common.js';
 import { readAllWorktreeMetadata, type WorktreePRInfo } from '../../../lib/worktree-metadata.js';
 import { createLogger } from '@automaker/utils';
 
@@ -121,6 +121,52 @@ async function scanWorktreesDirectory(
   return discovered;
 }
 
+/**
+ * Fetch open PRs from GitHub and create a map of branch name to PR info.
+ * This allows detecting PRs that were created outside the app.
+ */
+async function fetchGitHubPRs(projectPath: string): Promise<Map<string, WorktreePRInfo>> {
+  const prMap = new Map<string, WorktreePRInfo>();
+
+  try {
+    // Check if gh CLI is available
+    const ghAvailable = await isGhCliAvailable();
+    if (!ghAvailable) {
+      return prMap;
+    }
+
+    // Fetch open PRs from GitHub
+    const { stdout } = await execAsync(
+      'gh pr list --state open --json number,title,url,state,headRefName,createdAt --limit 100',
+      { cwd: projectPath, env: execEnv }
+    );
+
+    const prs = JSON.parse(stdout || '[]') as Array<{
+      number: number;
+      title: string;
+      url: string;
+      state: string;
+      headRefName: string;
+      createdAt: string;
+    }>;
+
+    for (const pr of prs) {
+      prMap.set(pr.headRefName, {
+        number: pr.number,
+        url: pr.url,
+        title: pr.title,
+        state: pr.state,
+        createdAt: pr.createdAt,
+      });
+    }
+  } catch (error) {
+    // Silently fail - PR detection is optional
+    logger.warn(`Failed to fetch GitHub PRs: ${getErrorMessage(error)}`);
+  }
+
+  return prMap;
+}
+
 export function createListHandler() {
   return async (req: Request, res: Response): Promise<void> => {
     try {
@@ -241,11 +287,21 @@ export function createListHandler() {
         }
       }
 
-      // Add PR info from metadata for each worktree
+      // Fetch open PRs from GitHub to detect PRs created outside the app
+      const githubPRs = await fetchGitHubPRs(projectPath);
+
+      // Add PR info from metadata or GitHub for each worktree
       for (const worktree of worktrees) {
         const metadata = allMetadata.get(worktree.branch);
         if (metadata?.pr) {
+          // Use stored metadata (more complete info)
           worktree.pr = metadata.pr;
+        } else {
+          // Fall back to GitHub PR detection
+          const githubPR = githubPRs.get(worktree.branch);
+          if (githubPR) {
+            worktree.pr = githubPR;
+          }
         }
       }