feat(hyprland): add per-monitor workspace homing and monitor nav binds

New `local.hyprland.workspaceRules` option binds workspaces to monitor
connectors so each has a home screen; a consumer sets it from its own host
config (empty by default). Soft binding — an absent monitor's workspaces fall
back to an active one, so a laptop-only session still works.

`$mod+o` / `$mod SHIFT+o` focus and move the current workspace to the other
monitor. When rules are set, an `exec-once` nudges a single-monitor session to
workspace 1 rather than a support monitor's high default.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

modules/home.nix

@@ -81,7 +81,7 @@ let
   '';
 in
 {
-  imports = [ ./gpg.nix ./media.nix ./texlive.nix ./librewolf.nix ./mc.nix ./mime.nix ];
+  imports = [ ./gpg.nix ./media.nix ./texlive.nix ./librewolf.nix ./mc.nix ./mime.nix ./hyprland-workspaces.nix ];
 
   # Put ~/.local/bin (the XDG user-bin dir) on PATH so hand-dropped scripts run
   # by name without wiring each through nix.
@@ -578,6 +578,10 @@ in
         # master area width. Master layout uses `mfact`, not dwindle's `splitratio`.
         "$mod,		h,	layoutmsg,	mfact -0.05"
         "$mod,		l,	layoutmsg,	mfact +0.05"
+        # Move focus / the current workspace to the other monitor ("o" = other).
+        # With two monitors the relative +1 just toggles between them.
+        "$mod,		o,	focusmonitor,			+1"
+        "$mod SHIFT,	o,	movecurrentworkspacetomonitor,	+1"
       ] ++ (
         # Dynamic definitions for viewing workspaces 1 to 9 and moving windows between them.
         # References physical key codes for robustness with the SHIFT key, e.g. `code:10` instead of `1`.