Stock glue: credits music, cursor hide, status number, Model pane lights

[samwhosung]

Four stock glue screen defects:

• Credits raised a Lua error: PlayCreditsMusic was unbuilt. It now fades the theme and plays the seven city intro tracks in turn (0x45b000, table 0x836028).
• HideCursor/ShowCursor (0x46db70) only set a flag. The pointer now hides over the credits and the movie on every platform.
• A world status past the 83-row table read RESPONSE_FAILURE's text; GetStatus formats it "(N)" (0x5aa960).
• A plain Model pane (the realm wizard) was lit only by the widget's light. It now takes its M2's own lights, as 0x718960 emits them, under the widget light and fog.

Also writes the Deviation line for the config save: benilla saves a quiet second after a change, where SaveConfig (0x63d980) writes only at world entry, logout and shutdown, so a crash keeps the settings.

Tests cover each.

Fixes #1070
Fixes #1069
Fixes #1058
Fixes #1082

🤖 Generated with Claude Code

🤖 Generated with Claude Code