Add long-right-press as a shortcut to the now playing screen

Implemented for both the wheel and d-pad input methods.

lua/main.lua

@@ -70,6 +70,18 @@ local function init_ui()
         end
       end
     end),
+    controls.scheme:bind(function()
+      -- Set up a shortcut for jumping straight to the 'now playing' screen.
+      -- Implemented as a binding so that the shortcut is still applied even if
+      -- the control scheme is changed at runtime.
+      local hooks = controls.hooks()
+      local input_method = hooks.wheel or hooks.dpad
+      if input_method and input_method.right then
+        input_method.right.long_press = function()
+          require("playing"):push_if_not_shown()
+        end
+      end
+    end),
     sd_card.mounted:bind(function(mounted)
       backstack.reset(main_menu:new())
     end),

luals-stubs/controls.lua

@@ -7,6 +7,7 @@
 --- @field scheme Property The currently configured control scheme
 --- @field scroll_sensitivity Property How much rotational motion is required on the touchwheel per scroll tick.
 --- @field lock_switch Property  The current state of the device's lock switch.
+--- @field hooks funtion Returns a table containing the inputs and actions associated with the current control scheme.
 local controls = {}
 
 return controls