Fix minimal CI lane (gegl=disabled): move _proceed_* out of the GEGL guardmain

The _proceed_prev/next/first/last helpers are trivial wrappers over the
public ggaze_window navigation API and do not depend on GEGL, but were
defined only inside the #if GGAZE_HAVE_GEGL block. The always-compiled
_action_prev/next/first/last handlers reference them via _maybe_save_then,
so the gegl=disabled (minimal) lane failed with '_proceed_prev undeclared'
(regression introduced by the enhance save-dialog commit, before M8 marks).
Move the four helpers out of the GEGL guard so they are always compiled.

Verified: meson setup build-min -Dgegl=disabled -Djxl=disabled -Davif=disabled -Dheif=disabled && ninja -C build-min && meson test -C build-min (23/23 OK); default gegl=enabled lane still 24/24 OK.

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