libchev 1.1.2

Fix native debug frame artwork stretching across the panel by clearing inherited texture anchors and explicitly sizing native corners, border strips and the title background.

The user confirmed the corrected appearance in-game. The shared controller and addon-owned restriction guards are unchanged.

Validation: 88 Lua checks pass in both orders on Lua 5.1/5.2; 24 vendor checks pass; parsing, formatting and whitespace checks pass. All GitHub PR checks passed. Runtime bytes are identical to the visually confirmed candidate.