Add Packages inventory screen and auto-scrap duplicate package pulls

Packages are unique-per-type; duplicate pulls now auto-scrap into Cache
(mirroring the distro dupe->Merges path) instead of a dead-end merges
pool, and the pull reveal shows "-> N cache" for the dupe card. Save
loading collapses any pre-existing duplicate package entries to the
highest-level instance and grants Cache for the extras, logging the
migration.

Also adds a dedicated Packages tab in the Collection screen (master
list with slot filter/sort + affordability hints, detail panel with
upgrade/scrap actions) so the whole inventory can be managed from one
place, sharing state with the existing per-distro Packages sub-tab.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MQmck8EqqWxSq5uVZ4E7yN

Assets/Scripts/Meta/GachaPullContext.cs

@@ -127,6 +127,9 @@ namespace KernelPanic.Meta
         public string DisplayName { get; }
         public GachaRewardType RewardType { get; }
         public PullOutcomeKind OutcomeKind { get; }
+
+        // Holds distro dupe merges, or (when RewardType is Package) the Cache a duplicate package
+        // pull was auto-scrapped for. See StatusText for which unit applies.
         public int MergesAwarded { get; }
         public IReadOnlyList<Language> LanguagesUnlocked { get; }
         public bool Guaranteed { get; }
@@ -139,11 +142,12 @@ namespace KernelPanic.Meta
         {
             get
             {
+                string dupeUnit = RewardType == GachaRewardType.Package ? "cache" : "merges";
                 return OutcomeKind switch
                 {
                     PullOutcomeKind.Granted => "NEW",
-                    PullOutcomeKind.Dupe => $"→ {MergesAwarded} merges",
-                    PullOutcomeKind.DupeOverflow => $"→ {MergesAwarded} merges",
+                    PullOutcomeKind.Dupe => $"→ {MergesAwarded} {dupeUnit}",
+                    PullOutcomeKind.DupeOverflow => $"→ {MergesAwarded} {dupeUnit}",
                     _ => Guaranteed ? "guaranteed" : PityTriggered ? "pity" : string.Empty
                 };
             }