Fix packaged build: weak ptr timing, factory module, hard refs, brace fix

Critical fixes for packaged builds:
- Widget weak ptrs (SpawnManager/SceneSerializer) are null in packaged due to
  HUD deferred init. All button lambdas now get references fresh from
  PlayerController via GetOwningPlayer() cast instead of cached weak ptrs.
- HUD BeginPlay deferred by one tick (SetTimerForNextTick) to ensure
  PlayerController has initialized SpawnManager before wiring.

Module split:
- Factories moved to separate PS_EditorTools module (Type: Editor)
  to fix UHT error with UFactory in packaging builds.
- PS_Editor module no longer depends on UnrealEd for factories.

Asset references:
- TSoftObjectPtr/TSoftClassPtr changed to TObjectPtr/TSubclassOf for
  MasterCatalog, SpawnCatalogs, and ActorClass entries. Hard references
  ensure assets are cooked in packaged builds.

Other fixes:
- GetActorLabel() replaced with GetClass()->GetName() (editor-only API)
- Missing brace in Browse dialog BaseLevel sync code
- BaseLevel sync only when scenario specifies a LevelName (no more clearing on empty)
- Save As dialog with native Windows file picker
- Debug info in catalog UI when empty (shows chain: Master→Catalogs→Entries)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Unreal/Build/Windows/Engine/Content/SlateDebug/Fonts/LastResort.tps

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TpsData xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <Name>Last Resort Font</Name>
+  <Location>/Engine/Content/SlateDebug/Fonts/LastResort.ttf</Location>
+  <Date>2016-06-10T14:17:31.3888811-04:00</Date>
+  <Function>The Last Resort font is a collection of glyphs to represent types of Unicode characters</Function>
+  <Justification>These glyphs are designed to allow users to recognize an encoded value in scenarios where the desired font doesn’t provide a character</Justification>
+  <Eula>http://www.unicode.org/policies/lastresortfont_eula.html</Eula>
+  <RedistributeTo>
+    <EndUserGroup>Licensees</EndUserGroup>
+    <EndUserGroup>Git</EndUserGroup>
+    <EndUserGroup>P4</EndUserGroup>
+  </RedistributeTo>
+  <LicenseFolder>/Engine/Source/ThirdParty/Licenses/LastResortFont_License.txt</LicenseFolder>
+</TpsData>