fix(D.5.3a): selected-object meter visual-gate fixes (name, gate, flash, magenta)

Visual gate against retail surfaced several fidelity gaps in the selected-object
strip; all fixed and user-confirmed. Faithful to gmToolbarUI::HandleSelectionChanged
(acclient_2013_pseudo_c.txt:198635) + RecvNotice_UpdateObjectHealth (:196213).

- UiMeter.DrawHBar: guard each slice on `id != 0` BEFORE resolve. resolve(0)
  returns the 1x1 magenta placeholder with a non-zero GL handle, so the single-
  image meter (caps id=0) was drawing 1px magenta caps at the bar's ends. The
  3-slice vitals meter (all ids set) was unaffected. (the magenta-lines bug)
- SelectedObjectController: meter visibility is now UpdateHealth-driven (shown when
  health is known for the selected guid — HasHealth at select or HealthChanged),
  not shown-on-select; brief green selection flash via Tick revert; overlay floated
  above the meter so the flash isn't hidden by the bar; name top-aligned into the
  bar sprite's black band (NameBandHeight) with the bar below.
- GameWindow.IsHealthBarTarget: gate the health bar on the server PWD bits
  BF_ATTACKABLE (0x10) | BF_PLAYER (0x8) — friendly/vendor NPCs and attackable
  Doors (Misc type) are name-only; players/monsters get the bar. Replaces the
  too-loose IsLiveCreatureTarget. Wired SelectedObjectController.Tick in OnUpdate.
- CombatState.HasHealth(guid): distinguishes a known health value from the 1.0
  default, so a re-selected already-assessed target shows its bar immediately.
- TextureCache.GetOrUploadRenderSurface: resolve the surface's DefaultPaletteId
  so paletted (P8/INDEX16) UI sprites decode instead of falling to magenta.
- ToolbarController.HiddenIds: also hide 0x100001A3 (stack-entry box) — retail
  hides it in HandleSelectionChanged; it was rendering as a stray black box.

Divergence register: AP-47 (meter-visible timing) retired (now faithful); AP-46
rewritten to the BF_ATTACKABLE/BF_PLAYER gate approximation. Full suite green
(2,688 passed / 4 skipped). User-confirmed: name on top, NPC name-only, monster
bar on assess, green flash, no magenta.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/AcDream.App/UI/Layout/ToolbarController.cs

@@ -39,11 +39,13 @@ public sealed class ToolbarController
     // Ids confirmed from the toolbar LayoutDesc dump.
     // 0x100001A1 (health meter) is now OWNED by SelectedObjectController (D.5.3a) —
     // it hides A1 at bind and shows it on a health-target selection, so A1 is removed
-    // from here to avoid double-ownership. 0x100001A2 (mana meter) and 0x100001A4
-    // (stack slider) are DEFERRED features (mana #140, stack-split UI) with no controller
-    // yet, so they stay hidden here — otherwise their dat back-track sprites render as
-    // stray empty bars on the toolbar.
-    private static readonly uint[] HiddenIds = { 0x100001A2, 0x100001A4 };
+    // from here to avoid double-ownership. 0x100001A2 (mana meter), 0x100001A3 (stack-size
+    // entry box) and 0x100001A4 (stack slider) are DEFERRED features (mana #140, stack-split
+    // UI) with no controller yet, so they stay hidden here — otherwise their dat sprites
+    // render as stray bars / a black box on the toolbar. Retail hides A3/A4 in
+    // gmToolbarUI::HandleSelectionChanged (acclient_2013_pseudo_c.txt:198660/198742),
+    // showing them only for a stacked-item selection.
+    private static readonly uint[] HiddenIds = { 0x100001A2, 0x100001A3, 0x100001A4 };
 
     // Four mutually-exclusive combat-mode indicator elements — exactly one visible at a time.
     // Index 0 = NonCombat (peace), 1 = Melee, 2 = Missile, 3 = Magic.