fix(D.2b): draw UI sprites in submission order so stamina/mana numbers render

TextRenderer batched sprites per-texture and drew each texture's whole buffer at
its FIRST-insertion point. The dat-font glyph atlas is one shared texture used by
all three vital numbers; it first appeared at the health bar, so all three numbers
were emitted right after the health bars — then the stamina + mana bar sprites
painted over their own numbers (only health survived). Replaced the per-texture
dictionary with submission-ordered segments (consecutive same-texture quads still
batch); each meter's number now draws after its own bars. The renderer's own
comment had predicted this break once bars became sprites (importer did that).
Removed the temporary UiMeter label diagnostic.

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

src/AcDream.App/UI/UiMeter.cs

@@ -16,6 +16,7 @@ namespace AcDream.App.UI;
 /// </summary>
 public sealed class UiMeter : UiElement
 {
+
     /// <summary>Fill fraction provider; a null result draws an empty bar.</summary>
     public Func<float?> Fill { get; set; } = () => 0f;
     /// <summary>Centered overlay text provider (e.g. "291/291"); null = none.</summary>