Phase 7: cockpit overlay generator, region extraction, and profile editor

Overlay generator (pure, tested) — RioJoy.Core/Overlay:
- FontFitter ports the legacy calc-fontsize auto-fit search (validated against a
  brute-force oracle); OverlayLayoutEngine ports create-data-layer's fit + h/v
  justification and adds per-region 90 deg CCW rotation; OverlayTemplate/Region +
  OverlayTemplateStore hold cell geometry/colour/rotation (regions.json).
- GoobieDataImporter parses the legacy .data label sheet into label rows.
- src/RioJoy.Overlay: SkiaSharp rasterizer (SkiaTextMeasurer shared with the engine
  so measured layout == drawn output; SkiaOverlayRenderer -> PNG;
  ProfileWallpaperGenerator). Verified end-to-end on the real cockpit art
  (regions.json + riojoy.png + TEST.data) by OverlayRenderIntegrationTests.
- RioJoy.Tray/WallpaperApplier applies via SystemParametersInfo; RioCoordinator
  generates+applies on profile activation (opt-in via AppConfig.OverlayTemplatePath).

Region geometry — tools/XcfRegionExtract parses riojoy.xcf (a GIMP-format binary
reader, no GIMP needed) into the 119-cell regions.json: per-layer offsets/size/
font/colour, with 90 deg CCW rotation on a-00 + b-10..b-1F. Base image riojoy.png.
NOTE: the wallpaper positions are a VGA chroma-split display artifact (6 displays),
not the cockpit's logical layout.

Mapping editor (first cut) — RioJoy.Tray/Editor/ProfileEditorForm renders the
config sheet's logical grid (SheetLayout parses the sheet CSV export). The iRIO
word is edited via ButtonBinding <-> RioMapEntry.Create (no hex bit-twiddling), with
a context-sensitive picker: keyboard keys by name (KeyCatalog VK names), joystick
Button N, hat direction, mouse/RIO-command enum names; modifiers only for keyboard.
Opened from the tray ("Edit profile..."). The sheet-grid layout is a starting point
that needs rework from a better-formatted source.

~220 xUnit tests green. Docs (PLAN.md, README) updated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/RioJoy.Core/Profiles/AppConfig.cs

@@ -32,6 +32,13 @@ public sealed class AppConfig
     /// <summary>Start RIOJoy with Windows.</summary>
     public bool AutoStart { get; set; }
 
+    /// <summary>
+    /// Path to the cockpit overlay template (<c>regions.json</c>) used to generate
+    /// per-profile wallpapers (Phase 7). Null disables wallpaper generation. The
+    /// template's base image is resolved relative to this file's folder.
+    /// </summary>
+    public string? OverlayTemplatePath { get; set; }
+
     /// <summary>Find a profile by name (case-insensitive), or null.</summary>
     public RioProfile? FindProfile(string? name) =>
         name is null

src/RioJoy.Core/Profiles/RioProfile.cs

@@ -35,6 +35,14 @@ public sealed class RioProfile
     /// <summary>Cockpit wallpaper image path (generated in Phase 7).</summary>
     public string? WallpaperPath { get; set; }
 
+    /// <summary>
+    /// Overlay label text per template region (region/layer name → display text,
+    /// e.g. <c>"b-00" → "FIRE"</c>). Drives the Phase 7 wallpaper generator
+    /// (<see cref="Overlay.OverlayLayoutEngine"/>); empty/absent entries render
+    /// nothing. The region geometry itself lives in the shared overlay template.
+    /// </summary>
+    public Dictionary<string, string> OverlayLabels { get; set; } = new();
+
     /// <summary>
     /// Executable names that select this profile when they are the foreground app
     /// (matched case-insensitively, with or without ".exe").