fix(chargen): Campaign CC gate round 1 closeout — Group 2: Skills page four-bucket model

Ports the last remaining half of retail's Skills page: the four-bucket
sorted skill list (Specialized/Trained/UseableUntrained/UnuseableUntrained,
UpdateSkillEntry's own iMinlevel <= 1 test), plus the info box's
description + formula completion.

- ChargenSkillDetail/ChargenSkillFormula (Core) thread SkillBase.MinLevel/
  Description/Formula from the global SkillTable, exposed via a new
  ChargenOptions.TryGetSkillDetail (nullable-with-default parameter, so
  every pre-existing ChargenOptions call site compiles unchanged).
  ChargenTableReader.Project populates it from the same SkillTable loop
  that already builds GlobalSkillCostsBySkillId.
- CharacterCreationSkillsPage.RebuildRows now groups every costable skill
  into SkillBucket, sorts each bucket alphabetically by name
  (InsertEntrySorted's wcscmp, ported as string.CompareOrdinal), and
  builds one Templates[0] header row per bucket ahead of that bucket's
  Templates[1] skill rows — DoSkillRecords' own unconditional
  4-header-then-populate order. A level change re-buckets the row
  (detected per-refresh against each row's own cached bucket, then a
  full rebuild with the current selection explicitly preserved).
- RefreshInfoBox now composes description (word-wrapped via
  DatRichText.Compose) + the level-gated bonus line (an exact, unwrapped
  literal — NOT routed through word-wrap, which would have collapsed its
  authored double-space formatting) + ComposeFormula's "Formula : ..."
  line (MakeSkillFormula ported with high confidence for the prefix/
  per-attribute-term/divisor/bonus-suffix shape; the two-attribute
  connector text is a disclosed approximation, register AP-231, since
  the decompiled function's own connector literals could not be
  recovered byte-exact by this session's static-only tooling).

Register: AP-213 RETIRED (160 active rows). Live-DAT gate: the installed
SkillTable's MinLevel distribution matches the investigation's own
recorded finding exactly (38 entries, 23 useable-untrained / 15
trained-required). 3 new fixture tests + 1 new live-DAT test; 3
pre-existing integration tests fixed (they captured row widget
references before a bucket-changing click, which now rebuilds and
discards those references — a real, correct consequence of the new
model, not a bug).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.Content/CharGen/ChargenTableReader.cs

@@ -81,22 +81,39 @@ public static class ChargenTableReader
             heritagesById[pair.Key] = ProjectHeritage(pair.Key, pair.Value);
 
         var globalSkillCosts = new Dictionary<uint, ChargenSkillCost>(skillTable?.Skills.Count ?? 0);
+        // Group 2 (Campaign CC gate round 1 closeout): SkillBase.MinLevel/
+        // Description/Formula — GLOBAL only, no per-heritage counterpart
+        // (see ChargenSkillDetail's own doc).
+        var globalSkillDetails = new Dictionary<uint, ChargenSkillDetail>(skillTable?.Skills.Count ?? 0);
         if (skillTable is not null)
         {
             foreach (KeyValuePair<DatReaderWriter.Enums.SkillId, SkillBase> pair in skillTable.Skills)
             {
                 uint skillId = (uint)pair.Key;
+                SkillBase skill = pair.Value;
                 globalSkillCosts[skillId] = new ChargenSkillCost(
                     skillId,
-                    pair.Value.TrainedCost,
-                    pair.Value.SpecializedCost);
+                    skill.TrainedCost,
+                    skill.SpecializedCost);
+                globalSkillDetails[skillId] = new ChargenSkillDetail(
+                    skillId,
+                    skill.MinLevel,
+                    skill.Description.Value,
+                    new ChargenSkillFormula(
+                        skill.Formula.AdditiveBonus,
+                        skill.Formula.Attribute1Multiplier,
+                        skill.Formula.Attribute2Multiplier,
+                        skill.Formula.Divisor,
+                        (uint)skill.Formula.Attribute1,
+                        (uint)skill.Formula.Attribute2));
             }
         }
 
         return new ChargenOptions(
             Array.AsReadOnly(starterAreas),
             heritagesById.ToFrozenDictionary(),
-            globalSkillCosts.ToFrozenDictionary());
+            globalSkillCosts.ToFrozenDictionary(),
+            globalSkillDetails.ToFrozenDictionary());
     }
 
     private static ChargenStarterArea ProjectStarterArea(int index, StartingArea area)