imv: add default Ctrl+P binding to print current image via CUPS (#2872)

* imv: add default Ctrl+P binding to print current image via CUPS

* Add imv config migration with backup

---------

Co-authored-by: David Heinemeier Hansson <david@hey.com>

config/imv/config

@@ -0,0 +1,2 @@
+[binds]
+<Ctrl+p> = exec lp $imv_current_file

migrations/1761569743.sh

@@ -0,0 +1,9 @@
+echo "Add default Ctrl+P binding for imv; backup existing config if present"
+
+if [ -f ~/.config/imv/config ]; then
+  cp ~/.config/imv/config ~/.config/imv/config.bak.$(date +%s)
+else
+  mkdir -p ~/.config/imv
+fi
+
+cp ~/.local/share/omarchy/config/imv/config ~/.config/imv/config