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/ui/src/components/views/board-view/worktree-panel/components/worktree-actions-dropdown.tsx

@@ -217,27 +217,20 @@ export function WorktreeActionsDropdown({
             )}
           </DropdownMenuItem>
         </TooltipWrapper>
-        {!worktree.isMain && (
-          <TooltipWrapper
-            showTooltip={!!gitOpsDisabledReason}
-            tooltipContent={gitOpsDisabledReason}
+        <TooltipWrapper showTooltip={!!gitOpsDisabledReason} tooltipContent={gitOpsDisabledReason}>
+          <DropdownMenuItem
+            onClick={() => canPerformGitOps && onResolveConflicts(worktree)}
+            disabled={!canPerformGitOps}
+            className={cn(
+              'text-xs text-purple-500 focus:text-purple-600',
+              !canPerformGitOps && 'opacity-50 cursor-not-allowed'
+            )}
           >
-            <DropdownMenuItem
-              onClick={() => canPerformGitOps && onResolveConflicts(worktree)}
-              disabled={!canPerformGitOps}
-              className={cn(
-                'text-xs text-purple-500 focus:text-purple-600',
-                !canPerformGitOps && 'opacity-50 cursor-not-allowed'
-              )}
-            >
-              <GitMerge className="w-3.5 h-3.5 mr-2" />
-              Pull & Resolve Conflicts
-              {!canPerformGitOps && (
-                <AlertCircle className="w-3 h-3 ml-auto text-muted-foreground" />
-              )}
-            </DropdownMenuItem>
-          </TooltipWrapper>
-        )}
+            <GitMerge className="w-3.5 h-3.5 mr-2" />
+            Pull & Resolve Conflicts
+            {!canPerformGitOps && <AlertCircle className="w-3 h-3 ml-auto text-muted-foreground" />}
+          </DropdownMenuItem>
+        </TooltipWrapper>
         <DropdownMenuSeparator />
         {/* Open in editor - split button: click main area for default, chevron for other options */}
         {effectiveDefaultEditor && (
@@ -332,7 +325,7 @@ export function WorktreeActionsDropdown({
           </TooltipWrapper>
         )}
         {/* Show PR info and Address Comments button if PR exists */}
-        {!worktree.isMain && hasPR && worktree.pr && (
+        {hasPR && worktree.pr && (
           <>
             <DropdownMenuItem
               onClick={() => {