feat(studio): Character panel pilot — gmCharacterInfoUI report text + menu-bar picker

Task A — CharacterController (LayoutDesc 0x2100002E)
- CharacterSheet.cs: data record for all fields used by the report sections,
  with retail property-id citations per field (DateOfBirth 0x62, TotalPlayTime
  0x7d, NumDeaths 0x2b, SkillCredits 0xb5/0xc0, AugmentationStat 0x162,
  EncumbranceVal 0x5/0xe6).
- CharacterController.cs: static Bind(layout, data, datFont) wires element
  0x1000011d (m_pMainText, confirmed gmCharacterInfoUI::PostInit 0x004b86f0) as
  a UiText; LinesProvider builds the report. Report section order mirrors
  gmCharacterInfoUI::Update (0x004ba790):
  1. UpdatePlayerBirthAgeDeaths 0x004b8cb0 — birth/age/deaths
  2. UpdateEnduranceInfo 0x004b8eb0 — vitals (H/S/M cur/max)
  3. UpdateInnateAttributeInfo 0x004b87e0 — 6 attrs InqAttribute 1,2,4,3,5,6
     = Strength, Endurance, Quickness, Coordination, Focus, Self
  4. UpdateFakeSkills 0x004b8930 — skill credits (InqInt 0xb5 / 0xc0)
  5. UpdateAugmentations 0x004b9000 — aug name (InqInt 0x162 switch 1..0xb)
  6. UpdateLoad 0x004b8a20 — burden cur/max/pct
  Element 0x1000011d imports as UiText (Type 12); multi-line text set via
  LinesProvider — same pattern as ChatWindowController transcript.
- SampleData.SampleCharacter(): plausible retail-scale CharacterSheet fixture.
- FixtureProvider.Populate case 0x2100002Eu: CharacterController.Bind with
  SampleData.SampleCharacter + VitalsDatFont.
- CharacterControllerTests.cs: 10 pure data-wiring + content tests (no GL/dats).

Task B — Studio panel picker → main menu bar
- StudioWindow.OnRender: replaced the floating "Studio" toolbar window (kToolbarH
  40px) with ImGui.BeginMainMenuBar / EndMainMenuBar (kMenuBarH 22px). Panel
  picker combo now lives in the always-on-top menu bar and cannot be occluded by
  Tree/Canvas/Props panes. paneY reduced from 40→22, freeing ~18px for the canvas.

Build: dotnet build green (0 CS errors; DLL-lock warnings are AcDream.App being
live — not compile errors). Full suite: 619 passed, 2 skipped.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/AcDream.App/Studio/StudioWindow.cs

@@ -279,21 +279,43 @@ public sealed class StudioWindow : IDisposable
         _imgui.BeginFrame((float)dt);
 
         // ── Layout constants (fixed pane arrangement, FirstUseEver) ──────────────
-        // Toolbar: full width, 40px tall at y=0.
-        // Tree:    280px wide on the left, below toolbar.
+        // MenuBar: always-on-top main menu bar (~22px) — panel picker lives here so it
+        //          is never covered by the floating panes (replaces the old 40px toolbar).
+        // Tree:    280px wide on the left, below menu bar.
         // Canvas:  centre strip between tree and properties.
-        // Props:   340px wide on the right, below toolbar.
-        const int kToolbarH  = 40;
+        // Props:   340px wide on the right, below menu bar.
+        const int kMenuBarH  = 22;   // ImGui default main menu bar height
         const int kTreeW     = 280;
         const int kPropsW    = 340;
         int canvasX  = kTreeW;
         int canvasW  = Math.Max(1, iw - kTreeW - kPropsW);
         int propsX   = iw - kPropsW;
-        int paneY    = kToolbarH;
-        int paneH    = Math.Max(1, ih - kToolbarH);
+        int paneY    = kMenuBarH;
+        int paneH    = Math.Max(1, ih - kMenuBarH);
 
-        // 5. Toolbar pane — slug picker.
-        string? pickedSlug = _inspector.DrawToolbar(_dumpSlugs, _currentSlug, iw);
+        // 5. Main menu bar — panel picker combo pinned to the window top.
+        // BeginMainMenuBar returns true when the bar is visible (always is); the combo
+        // inside it is always-on-top and is never occluded by Tree/Canvas/Props panes.
+        string? pickedSlug = null;
+        if (ImGuiNET.ImGui.BeginMainMenuBar())
+        {
+            ImGuiNET.ImGui.SetNextItemWidth(300f);
+            string preview = _currentSlug ?? "(none)";
+            if (ImGuiNET.ImGui.BeginCombo("Panel", preview))
+            {
+                foreach (var slug in _dumpSlugs)
+                {
+                    bool selected = string.Equals(slug, _currentSlug,
+                        System.StringComparison.OrdinalIgnoreCase);
+                    if (ImGuiNET.ImGui.Selectable(slug, selected) && !selected)
+                        pickedSlug = slug;
+                    if (selected)
+                        ImGuiNET.ImGui.SetItemDefaultFocus();
+                }
+                ImGuiNET.ImGui.EndCombo();
+            }
+            ImGuiNET.ImGui.EndMainMenuBar();
+        }
         if (pickedSlug is not null)
             LoadDumpPanel(pickedSlug);