Fix displacement to use full screen buffer, not just viewport.

[Cerwym]

No description provided.

[Copilot]

Pull request overview

Updates the eye lens rendering path in creature view so displacement effects sample from the full offscreen buffer (full screen width) rather than only the viewport slice, fixing incorrect displacement lookups when a sidebar is present.

Changes:

• Extend draw_lens_effect() API to accept viewport_x and adjust source buffering accordingly.
• Fix displacement lens rendering to use full-screen source indexing while rendering only the viewport area.
• Ignore .local/ directory in Git.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/thing_creature.c	Updates lens-effect call site to pass full source buffer and explicit viewport X offset.
src/lens_api.h	Updates draw_lens_effect() signature to include viewport_x.
src/lens_api.c	Implements viewport-aware source selection and correct displacement-map row stepping.
.gitignore	Adds .local/ to ignored paths.

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