fix(client): sprint 37 test-pass fixes — parse error + test hygiene

- character_creation.gd:1614: type-annotate dir_name to fix GDScript
  inference parse error. CARDINAL_DIRS is an untyped const Array, so
  `var dir_name := CARDINAL_DIRS[idx]` failed type inference and blocked
  test_character_creation_sprint28.gd test discovery. Runtime was lenient
  but gdUnit4's scanner is strict.
- test_merge_path_flows_sprint37.gd (_load_char_create): call add_child
  before _update_start_btn_state so @onready vars (_footer_start) are
  bound when the helper dereferences them. Unblocks 2 merge-path tests.
- test_anti_tedium.gd (test_bug_report_sends_unpause_on_close): call
  dialog.close() instead of the old dialog._close() rename casualty.
  `on_close()` is a lifecycle hook — it doesn't actually transition
  state; `close()` is what MetaScreen exposes.
- test_anti_tedium.gd (before_test): clear MetaStack._stack. Prior tests
  leave stale freed dialog refs on the stack; _any_pausing() iterates
  the stack during close() and crashes with "previously freed".

Net: sprint-37 test files (test_merge_path_flows_sprint37.gd,
test_anti_tedium.gd) now pass. Overall suite: 2428/2488 passing
(60 remaining failures are pre-existing, unrelated to sprint 37).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

client/ui/meta/screens/character_creation/character_creation.gd

@@ -1611,7 +1611,7 @@ func _take_screenshot(suffix: String = "") -> void:
 		# Take screenshot for current cardinal, then advance. Single array for
 		# both facing and filename label — previously two arrays with different
 		# orderings produced swapped labels at indices 1 and 3.
-		var dir_name := CARDINAL_DIRS[_screenshot_cardinal_idx]
+		var dir_name: String = CARDINAL_DIRS[_screenshot_cardinal_idx]
 		_char_visual.set_facing(dir_name)
 		suffix = dir_name