feat(ui): Campaign CT slice CT3 — Titles page live via standard GUI classes

Titles tab (AP-109's known-inert gap) now switches to a real page and
CharacterTitlesController binds it entirely through UiTemplateListBox/
UiScrollbar/UiButton — zero bespoke widgets, matching every other
social/options row-list page in this codebase.

Retail anchors: gmCharacterTitleUI::PostInit @0x0049A610; AddTitleToList
@0x0049A840 + FindSortedInsertPosition @0x0049A760 (rows sorted by
resolved display text — this port rebuilds the full sorted set on every
change rather than a positional splice, since UiTemplateListBox has no
insert-at-index primitive and no other consumer needs one either);
InfoRegion::SetState(selected?6:1) (row Highlight/DirectState swap, the
same mechanism CT1's SEALED VERDICT confirmed for the stat rows);
UpdateButtons @0x0049A500 CORRECTED direction (Ghosted unless a row is
selected whose id differs from the current display title — no selection
IS the Ghosted case); Refresh @0x0049abc0 (display-title text, including
the hardcoded "Unknown" fallback, refreshed on both TableReplaced and
DisplayTitleChanged per CT2's review anchor 1); Event_SetDisplayCharacterTitle
@0x006a5720 (wire-only TitleSet 0x002C send, no local mutation).

CharacterStatController.Bind now three-way switches Attributes/Skills/
Titles — Titles is a genuinely separate, non-duplicated page container
(CT1 ground truth §3), unlike Attributes/Skills which share one mounted
page and only rebind content.

The two page captions (0x1000052E/0x10000531) are left untouched:
LayoutImporter.BuildText already resolves every element's authored
StringInfo caption at import time, so no controller-side string lookup
was added.

New IGameRuntimeCommands.SetTitle seam on DeferredGameRuntimeStateCommands
(InteractionUiRuntimeSources.cs) mirrors the existing Advance() shape.
CharacterRuntimeBindings gains Titles/TitleResolver/SendSetTitle;
CharacterTitleResolver (CT2) is constructed once at composition time and
its .Resolve method group is passed to the controller as a delegate
(not the concrete DAT-backed type) so the controller stays hermetically
testable without a live IDatReaderWriter.

Tests (tests/AcDream.App.Tests/UI/Layout/CharacterTitlesControllerTests.cs):
binding-seam coverage against the REAL committed character_2100002E.json
fixture (verified this session to already carry the Titles page subtree,
including the ListBox's own authored TemplateList=[(0x2100005E,
0x10000536)] entry — RowTemplateResolver_ReceivesTheFixturesOwnAuthoredTemplateIds
proves the controller reads that authored pair, not a hardcoded one); a
hand-authored ElementInfo standing in only for the row template itself
(a separate LayoutDesc with no committed fixture yet — CT1 was a live-DAT
probe only); sorted-row order, Unknown fallback, row selection/highlight,
the ghost truth table (no selection / selected==display / selected!=
display), click-sends-exactly-one-SetTitle-and-mutates-nothing,
click-while-ghosted-sends-nothing, TableReplaced rebuild (including
selection survival when the id is still earned), TitleAdded single-row
growth, DisplayTitleChanged text+ghost refresh, and Dispose
unsubscription. CharacterStatControllerTests updated for the Titles tab
no longer being ClickThrough, plus a new tab-switch visibility test.

Register: amends AP-109 (docs/architecture/retail-divergence-register.md)
to record the Titles-page half as LIVE; the header identity block and
luminance fields remain open for CT4.

Suites: full solution 15,405 tests / 0 skips (App 6,130) green.

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

tests/AcDream.App.Tests/UI/Layout/CharacterStatControllerTests.cs

@@ -802,7 +802,10 @@ public class CharacterStatControllerTests
         Assert.Equal(
             new uint[] { 0x06005D93u, 0x06005D95u, 0x06005D97u },
             skills.Children.Cast<UiDatElement>().Select(child => child.ActiveMedia().File));
-        Assert.True(titles.ClickThrough);
+        // CT3 (2026-08-24): the Titles tab is no longer inert — it switches
+        // to a real page (previously AP-109's known gap).
+        Assert.False(titles.ClickThrough);
+        Assert.NotNull(titles.OnClick);
     }
 
     [Fact]
@@ -826,6 +829,45 @@ public class CharacterStatControllerTests
             Assert.Equal(RetailUiStateIds.Open, Assert.IsAssignableFrom<IUiDatStateful>(child).ActiveRetailStateId));
     }
 
+    /// <summary>
+    /// CT3 (2026-08-24): unlike Attributes/Skills (which share ONE mounted
+    /// page and only rebind its content), the Titles page (0x10000539) is a
+    /// genuinely separate, non-duplicated subtree (CT1 ground truth §3) that
+    /// must actually be shown/hidden on tab switch.
+    /// </summary>
+    [Fact]
+    public void TitlesTab_Click_ShowsTitlesPageAndHidesAttributesSkillsContent()
+    {
+        var layout = FixtureLoader.LoadCharacter();
+        var titlesTab = Assert.IsType<UiText>(layout.FindElement(CharacterStatController.TabTitlesId));
+        var attributesTab = Assert.IsType<UiText>(layout.FindElement(CharacterStatController.TabAttribId));
+        var titlesPage = layout.FindElement(CharacterStatController.TitlesPageId);
+        var attributesPage = layout.FindElement(CharacterStatController.AttributesPageId);
+        Assert.NotNull(titlesPage);
+        Assert.NotNull(attributesPage);
+
+        CharacterStatController.Bind(layout, SampleData.SampleCharacter,
+            spriteResolve: id => (id, 16, 16));
+
+        Assert.True(attributesPage!.Visible);
+        Assert.False(titlesPage!.Visible);
+
+        titlesTab.OnClick!();
+
+        Assert.True(titlesPage.Visible);
+        Assert.False(attributesPage.Visible);
+        Assert.Equal(RetailUiStateIds.Open, titlesTab.ActiveRetailStateId);
+        Assert.Equal(RetailUiStateIds.Closed, attributesTab.ActiveRetailStateId);
+
+        // Switching back to Attributes restores the shared content page and
+        // re-hides Titles.
+        attributesTab.OnClick!();
+
+        Assert.True(attributesPage.Visible);
+        Assert.False(titlesPage.Visible);
+        Assert.Equal(RetailUiStateIds.Closed, titlesTab.ActiveRetailStateId);
+    }
+
     // ── Affordability helpers (GetRaiseCost) ──────────────────────────────────
 
     [Fact]