Maps in widened views: TAB overlay in place, M map across the full width

- hud: shift SetViewport/Clear with moved windows (TAB overview map)
- megamap: view constants patched to the render width (clip, scroll limit,
  edge scrolling, centre, dark band, zoomed view and its markers); frame
  stretched to the screen edges, zoom controls and their click area centred
- hud: Anchor::Screen windows are drawn and clicked unshifted but still own
  the event scope
- autotest waits for log markers instead of fixed delays (~18 s per run)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/todo.md

@@ -56,9 +56,9 @@ follow.
 ## Map and map zoom in widened views
 
 Reported 2026-10-15: the map (and zooming it) does not support the widened
-render sizes yet (docs/widescreen.md, docs/hud.md: windows are laid out for
-1024 and centred). To check: the map window's draw area and the zoom's
-hardcoded 1024/768 (or 512/384 centre) values.
+render sizes yet. 2026-10-16: TAB map fixed (viewport shifted), M map spans
+the render width (docs/hud.md, "Large map"), zoomed view and its markers included.
+Confirmed in-game 2026-10-16.
 
 ## Quest dialog glitches in widened views