https://gitlab.synchro.net/main/sbbs/-/commit/5ece4c8de5947e95b00c5af1
Modified Files:
src/doors/termgfx/mouse.c mouse.h src/doors/termgfx/test/test_mouse.c Log Message:
termgfx: match mouse module comment style to the directory

mouse.h and mouse.c were the only top-level files in termgfx still
using /* ... */ block comments; every sibling (sgrmouse.h, sixel.h,
term.h, keymode.h, ...) uses // line comments exclusively. Convert
all of them, preserving wording; no code, identifiers, or escape
string literals changed.

Also strengthen test/test_mouse.c per review:
- add a Ps=3 ("permanently set") DECRPM case, since mouse.c's latch
condition is (params[1] == 1 || params[1] == 3) but only Ps=1 was
covered
- actually call termgfx_mouse_note_pixel_report() twice and assert
the latch is still 1, since the comment claimed idempotency but
the test only called it once

Removed the unused <stddef.h> include from mouse.c (no NULL/size_t
use in the file).

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