feat(ui): #409 — client-wide retail tooltip system

Full re-derivation from named-retail decomp: UIElement::StartTooltipAtMouse
@0x00460D70 -> UIElementManager::StartTooltip @0x0045DE90/@0x00459700,
UIElement::MouseHover @0x00462520 (P0x4B TooltipOn gate + global
m_tooltipEnable), UIElementManager::CheckTooltip @0x0045B6E0 (dwell/
auto-hide timer, default 0.25s/10s), SwitchMouseOver/DeletingElement
(dismissal). Corrects the earlier GF-16 investigation: P0x47 is the
element-desc id WITHIN the popup LayoutDesc (P0x48), not a "behavior
enum"; P0x4A is read off the popup's own instantiated root, not the
trigger element.

- ElementInfo/UiElement gain six tooltip data fields (P0x47/48/49/4A/4B/50),
  read generically by ElementReader and copied through LayoutImporter,
  mirroring the existing AuthoredInvisible passthrough pattern.
- UiRoot's existing CheckTooltip-derived hover timer gains TooltipShow/
  TooltipHide events, a per-element P0x50 delay override, and dismissal
  wiring at every retail-confirmed teardown site.
- RetailTooltipPresenter (owned by RetailUiRuntime, mounted alongside
  RetailDialogFactory) builds the popup via the existing LayoutImporter
  dat-lock seam, auto-resizes by the measured-vs-authored text delta
  (word-wrapped via the existing UiText.WrapWords primitive), positions
  at the mouse clamped to the display, and stays topmost over dialogs via
  its own later per-tick BringToFront (register AD-106).
- Misc.TooltipEnable/Misc.TooltipDelay are client-local UserPreferences
  (retail's own 2013 Config tab authors no visible row for either) —
  SettingsStore gains a MiscSettings section, no new options-panel row.
- Live-DAT sweep: 434 elements author >=1 trigger property (243 with
  literal text this port shows; 191 rely on retail's dynamic
  InqProperty(0x49) override, deferred as register TS-85 alongside the
  unmodeled P0x3D wrap-width override).

Gates: Release build 0 errors; App suite (live-DAT env) 5410/5407 passed/
3 skipped (was 5379/3); Runtime 1735/0 unchanged; UI.Abstractions 926/0;
full solution 14,617/14,548 passed/69 skipped/0 failed.

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

src/AcDream.UI.Abstractions/Panels/Settings/MiscSettings.cs

@@ -0,0 +1,33 @@
+namespace AcDream.UI.Abstractions.Panels.Settings;
+
+/// <summary>
+/// #409 (client-wide retail tooltip system): the two <c>Misc.*</c>
+/// <c>UserPreferences.ini</c> keys retail's <c>UIElementManager::Init
+/// @0x0045EE10</c> registers (<c>UIPreferences::AttachPreference</c>,
+/// <c>Misc_TooltipDelay</c>/<c>Misc_TooltipEnable</c>) and binds onto
+/// <c>UIElementManager::m_tooltipDelay</c>/<c>m_tooltipEnable</c>. These are
+/// CLIENT-LOCAL preferences, not part of the server-synced
+/// <c>CharacterOptionTable</c> — the #409 investigation confirmed retail's
+/// own 2013 Config tab does not expose a visible row for either (they exist
+/// in <c>UserPreferences.ini</c> and are registered engine-side, but
+/// <c>gmConfigUI::InitOptions</c>'s 27 authored rows never author one), so
+/// this record follows the <see cref="CameraTurningSettings"/>/
+/// <see cref="AudioSettings"/> client-local persistence precedent WITHOUT a
+/// matching options-panel row — persisted, but not (yet) user-editable
+/// in-client, exactly matching what retail itself ships.
+/// </summary>
+public sealed record MiscSettings(
+    bool TooltipEnable,
+    float TooltipDelaySeconds)
+{
+    /// <summary>
+    /// Retail's registered defaults: <c>m_tooltipEnable=1</c>,
+    /// <c>m_tooltipDelay=0.25f</c>
+    /// (<c>UIElementManager::UIElementManager @0x0045F5D0</c>). The
+    /// preference's registered clamp range is <c>[0,10]</c> seconds
+    /// (<c>UIPreferences::SetPreferenceRange(&amp;Misc_TooltipDelay, 0f, 10f)</c>).
+    /// </summary>
+    public static MiscSettings Default { get; } = new(
+        TooltipEnable: true,
+        TooltipDelaySeconds: 0.25f);
+}

src/AcDream.UI.Abstractions/Panels/Settings/SettingsStore.cs

@@ -12,7 +12,7 @@ public readonly record struct UiWindowPosition(float X, float Y);
 
 /// <summary>
 /// JSON-backed persistence for non-keybind settings (Display / Audio / Chat /
-/// Character; the OP9-retired <c>Gameplay</c> section is no longer read or
+/// CameraTurning / Character / Misc; the OP9-retired <c>Gameplay</c> section is no longer read or
 /// written — see the class's Schema note below for how a leftover
 /// <c>"gameplay"</c> block from an older settings.json is tolerated). The
 /// graphical host supplies a canonical portable configuration path. Coexists
@@ -280,6 +280,38 @@ public sealed class SettingsStore
     public void SaveCameraTurning(CameraTurningSettings cameraTurning)
         => SaveSection("cameraTurning", BuildCameraTurningObject(cameraTurning));
 
+    /// <summary>
+    /// #409: load the two <c>Misc.*</c> tooltip preferences. Same fall-back
+    /// behaviour as <see cref="LoadDisplay"/>.
+    /// </summary>
+    public MiscSettings LoadMisc()
+    {
+        if (!File.Exists(_path)) return MiscSettings.Default;
+        try
+        {
+            using var stream = File.OpenRead(_path);
+            var doc  = JsonDocument.Parse(stream);
+            var root = doc.RootElement;
+            if (!root.TryGetProperty("misc", out var misc)
+                || misc.ValueKind != JsonValueKind.Object)
+                return MiscSettings.Default;
+
+            var d = MiscSettings.Default;
+            return new MiscSettings(
+                TooltipEnable:       ReadBool (misc, "tooltipEnable",       d.TooltipEnable),
+                TooltipDelaySeconds: ReadFloat(misc, "tooltipDelaySeconds", d.TooltipDelaySeconds));
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"settings: failed to load {_path}: {ex.Message} — using defaults");
+            return MiscSettings.Default;
+        }
+    }
+
+    /// <summary>Save the tooltip preferences, preserving all other top-level keys.</summary>
+    public void SaveMisc(MiscSettings misc)
+        => SaveSection("misc", BuildMiscObject(misc));
+
     /// <summary>
     /// Load per-character settings keyed by <paramref name="toonKey"/>.
     /// Missing file or missing toon entry → <see cref="CharacterSettings.Default"/>.
@@ -652,6 +684,13 @@ public sealed class SettingsStore
             ["vsync"]       = d.VSync,
         };
 
+    private static SortedDictionary<string, object> BuildMiscObject(MiscSettings m)
+        => new(StringComparer.Ordinal)
+        {
+            ["tooltipDelaySeconds"] = m.TooltipDelaySeconds,
+            ["tooltipEnable"]       = m.TooltipEnable,
+        };
+
     private static SortedDictionary<string, object> BuildCameraTurningObject(CameraTurningSettings c)
         => new(StringComparer.Ordinal)
         {