Editor: rework to the original Win32 RIO control-panel layout

Reworked the profile/mapping editor to mirror the original unfinished Win32
RIO driver's control-panel design (docs/Win32RIO, by FASA / Michel Lowrance)
instead of the flat config-sheet grid. The wallpaper region positions are a
VGA chroma-split display artifact, not the cockpit's logical shape.

- RioJoy.Core.Editing.CockpitPanel: the functional layout — five MFD clusters,
  four board columns (Throttle/Secondary/Screen/Joystick-Hat), an encoder-gauge
  strip, and the two later-added 4x4 keypads (Internal/External). Places every
  address 0x00-0x47 / 0x50-0x6F exactly once (unit-tested).
- Tray PanelView/PanelCanvas render the panel; ProfileEditorForm drives it.
  Buttons show label + assigned function (ButtonBinding.Describe -> CTL-N, JOY1,
  POV-U, Mse LB, RIO command names; unit-tested). Lamp shade is driven by the
  IsLit flag (not by whether a function is assigned); keypads are neutral blue
  with no Lit checkbox. Added an Unassign button next to Apply.
- Removed the superseded sheet-grid UI (SheetView/SheetCanvas); SheetLayout +
  config-sheet.csv stay as reference data.

docs/Win32RIO: the original driver (tasgame.sys, a 32-bit kernel HID minidriver
that opened the serial port, set baud/8N1/DTR, and spoke the *identical* RIO
protocol -- AnalogRequest/Reply, Button Pressed/Released, Check/Lamp/Reset/
Version -- validating our protocol port), oemsetup.inf, RemoteDriver.doc, and the
extracted control-panel / game-controllers mockups.

~236 xUnit tests green. PLAN.md updated.

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

docs/PLAN.md

@@ -238,21 +238,22 @@ Replaces the legacy Google-Sheet → `.data` → GIMP → Script-Fu pipeline
   activation). The live `SystemParametersInfo` apply changes a user setting, so it
   is gated behind config and not exercised by tests. ⏳ Optional: restore the prior
   wallpaper when going dormant.
-- **Mapping editor — first cut done ✅.** `RioJoy.Tray/Editor/ProfileEditorForm`
-  shows the cockpit as a scrollable, clickable grid that mirrors the legacy
-  authoring spreadsheet's **logical** layout — parsed from the sheet's CSV export
-  (`docs/reference/customBackground/config-sheet.csv`) by `SheetLayout`, coloured
-  by section. (The layout deliberately follows the sheet, **not** the wallpaper
-  region positions: the wallpaper drives 6 displays via VGA chroma-channel
-  splitting, so its label positions stack and don't reflect the physical cockpit.)
-  Clicking an address cell edits its label and action/modifiers/lamp; the `iRIO`
-  word is read/written through `ButtonBinding` ↔ `RioMapEntry.Create` (round-trip
-  tested) — no hex bit-twiddling. The value field is a **context-sensitive picker**:
-  keyboard actions pick a key by name (`KeyCatalog` VK names), joystick a Button N,
-  hat a direction, mouse/RIO-command the enum name; modifiers enable only for
-  keyboard. Opened from the tray ("Edit profile…"); Save persists the profile.
-  ⏳ Still to refine: grouping a button's two bank addresses (edit once → both),
-  and clone-from-existing.
+- **Mapping editor — done ✅ (cockpit control-panel layout).**
+  `RioJoy.Tray/Editor/ProfileEditorForm` shows the cockpit as a clickable control
+  panel matching the **original Win32 RIO design** (docs/Win32RIO/, by FASA/Michel
+  Lowrance): five MFD clusters, four board columns (Throttle/Secondary/Screen/
+  Joystick-Hat), an encoder-gauge strip, and the two later-added 4×4 keypads
+  (rendered without lamps). The layout (`RioJoy.Core.Editing.CockpitPanel`, which
+  places every address 0x00–0x47 / 0x50–0x6F exactly once, unit-tested) deliberately
+  follows the design, **not** the wallpaper positions (those are a VGA chroma-split
+  display artifact). Lamp buttons shade Off/assigned; keypads are neutral. Clicking
+  a button edits its label and action/modifiers/lamp; the `iRIO` word goes through
+  `ButtonBinding` ↔ `RioMapEntry.Create` — no hex. The value field is a
+  context-sensitive picker (keyboard key by name via `KeyCatalog`, joystick Button N,
+  hat direction, mouse/RIO-command enum); modifiers enable only for keyboard.
+  Opened from the tray ("Edit profile…"); Save persists the profile.
+  ⏳ Still to refine: live encoder gauges, showing each button's assigned key as a
+  caption, grouping a button's two bank addresses, and clone-from-existing.
 - The unified profile JSON supersedes both `RIO.ini` and the Google Sheet, with
   importers for each.
 - To confirm at Phase 7: target wallpaper resolution(s); static wallpaper vs.