enhance: save hint in the panel + Save/Discard/Cancel dialog on navigation

Add a dim 's  Save enhanced copy' hint at the bottom of the enhance
panel so the save shortcut is visible right where the toggles are.

When you navigate to another image (h/l/g/G) with an unsaved enhance
preview active, a Save / Discard / Cancel alert now asks what to do:
Save exports <stem>-enhanced.<ext> with the enabled-preset chain then
moves on; Discard drops the preview and moves on; Cancel keeps the
preview and stays on the current image. _action_prev/next/first/last
route through _maybe_save_then; the s action and the dialog's Save
button share _enhance_do_save. Non-GEGL builds get a passthrough gate.

0 files changed, 0 insertions, 0 deletions