M7.4: Pause menu + save-from-pause, slot rows show wall-clock time

PauseMenuScreen — CanvasLayer overlay on PlayScreen, Layer=50 with
ProcessMode=WhenPaused so it stays responsive while the tree is
paused. _Ready sets GetTree().Paused=true; Resume/Close/QuitToTitle
unpause first. Two sub-states share one VBoxContainer-and-status-label
panel: main menu (Resume / ★ Level Up / Save Game / Quicksave / Quit
to Title) and slot picker. Save Game flips to the picker, click a
slot to write, back returns to main. Esc backs out of picker to main
on first press, closes the overlay on a second. CodexTheme applied
at the panel root since overlays mount outside PlayScreen's Control
tree and theme cascade doesn't cross CanvasLayer boundaries.

Level-up button surfaces only when LevelUpFlow.CanLevelUp(pc)
returns true (matches MonoGame), and is rendered disabled with a
"ships with M8" tooltip — fresh L1 characters won't see it in M7
play-tests.

Quit to Title autosaves first (matches MonoGame). A failed autosave
doesn't block the quit; better to let the user leave than trap them.

Save-from-pause writes to an internal status label inside the panel
rather than PlayScreen's save-flash toast — the toast lives on the
paused tree branch and would freeze mid-fade.

PlayScreen Esc now AddChild(new PauseMenuScreen(this)) instead of
BackToTitle. Added paused-guard + Echo filter in _Input. New public
PlayerCharacter() accessor lets the pause panel call CanLevelUp.
HUD hint updated to "F5 quicksaves · Esc opens pause".

SaveSlotFormat — shared helper between SaveLoadScreen (load picker)
and PauseMenuScreen (save picker) so both surfaces render rows with
the same prefix + in-game time + wall-clock time. Parses
SavedAtUtc, converts to local time, renders relative
(today/yesterday), short (MMM d, HH:mm within year), or full
(yyyy-MM-dd HH:mm), with "<unknown>" fallback for empty headers.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Theriapolis.Godot/Scenes/TitleScreen.cs

@@ -18,7 +18,7 @@ namespace Theriapolis.GodotHost.Scenes;
 /// </summary>
 public partial class TitleScreen : Control
 {
-    private const string VersionLabel = "PORT / GODOT · M7.3";
+    private const string VersionLabel = "PORT / GODOT · M7.4";
     private const string WizardScenePath = "res://Scenes/Wizard.tscn";
 
     public override void _Ready()