Fix ud and ssh

modules/home/terminal/wezterm.nix

@@ -207,6 +207,18 @@ in {
           end)
         end
 
+        -- scroll_or_passthrough: Ctrl+key scrolls at the shell prompt but passes
+        -- the key through when a program has taken the alt screen (vim, less, fzf…).
+        local function scroll_or_passthrough(key, pages)
+          return wezterm.action_callback(function(window, pane)
+            if pane:is_alt_screen_active() then
+              window:perform_action(act.SendKey({ key = key, mods = "CTRL" }), pane)
+            else
+              window:perform_action(act.ScrollByPage(pages), pane)
+            end
+          end)
+        end
+
         -- tab_is_zoomed: true if any pane in the current tab is zoomed.
         -- Used by move_vertical to decide whether to carry zoom forward.
         local function tab_is_zoomed(pane)
@@ -382,6 +394,16 @@ in {
         }
         config.tab_bar_at_bottom            = false
 
+        -- ─── SSH Domains ───────────────────────────────────────────────────────────
+
+        config.ssh_domains = {
+          {
+            name           = "muho",
+            remote_address = "muho",
+            username       = "muon",
+          },
+        }
+
         -- ─── Shell ─────────────────────────────────────────────────────────────────
 
         ${lib.optionalString (shell != null) ''
@@ -471,9 +493,11 @@ in {
           { key = "t", mods = "ALT", action = act.ShowTabNavigator },
           -- Alt+q: quit
           { key = "q", mods = "ALT", action = act.QuitApplication },
-          -- Ctrl+U/D: scroll half page (matches Alacritty)
+          -- Ctrl+U/D: scroll half page when at the shell prompt; pass through
-          { key = "u", mods = "CTRL", action = act.ScrollByPage(-0.5) },
+          -- to the running program when it is using the alt screen (vim, less,
-          { key = "d", mods = "CTRL", action = act.ScrollByPage(0.5) },
+          -- fzf, etc. switch to the alt screen and need the raw key).
+          { key = "u", mods = "CTRL", action = scroll_or_passthrough("u", -0.5) },
+          { key = "d", mods = "CTRL", action = scroll_or_passthrough("d",  0.5) },
           -- Copy / paste
           { key = "c", mods = "CTRL|SHIFT", action = act.CopyTo("Clipboard") },
           { key = "v", mods = "CTRL|SHIFT", action = act.PasteFrom("Clipboard") },