Show blocked goals as stalled in the TUI (#35886)

## What changed

- Display `Blocked` goal statuses as “stalled” in the goal menu and goal status footer.
- Update the goal menu snapshot and footer formatting test expectations.

GitOrigin-RevId: f3d8212d939f0d76354048231346328972226274

codex-rs/tui/src/chatwidget/goal_menu.rs

@@ -123,7 +123,7 @@ fn goal_status_label(status: AppThreadGoalStatus) -> &'static str {
     match status {
         AppThreadGoalStatus::Active => "active",
         AppThreadGoalStatus::Paused => "paused",
-        AppThreadGoalStatus::Blocked => "blocked",
+        AppThreadGoalStatus::Blocked => "stalled",
         AppThreadGoalStatus::UsageLimited => "usage limited",
         AppThreadGoalStatus::BudgetLimited => "limited by budget",
         AppThreadGoalStatus::Complete => "complete",

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__goal_menu_blocked.snap

@@ -3,7 +3,7 @@ source: tui/src/chatwidget/tests/goal_menu.rs
 expression: rendered_goal_summary(&mut rx)
 ---
 Goal
-Status: blocked
+Status: stalled
 Objective: Keep improving the bare goal command until it feels calm and useful.
 Time used: 1m
 Tokens used: 12.5K

codex-rs/tui/src/chatwidget/tests/status_and_layout.rs

@@ -3573,7 +3573,7 @@ fn goal_status_indicator_line_formats_goal_text() {
             "Goal unmet (4K / 5K tokens)",
         ),
         (GoalStatusIndicator::Paused, "Goal paused (/goal resume)"),
-        (GoalStatusIndicator::Blocked, "Goal blocked (/goal resume)"),
+        (GoalStatusIndicator::Blocked, "Goal stalled (/goal resume)"),
         (
             GoalStatusIndicator::UsageLimited,
             "Goal hit usage limits (/goal resume)",