refactor(map-editor): unify modal/menu state, drop cheatsheet_open

Adds menu_open, modal_open, show_layers_panel, show_palette to the
editor's state singleton; removes the now-redundant cheatsheet_open
flag. All cheatsheet-toggle paths route through the new generic
modal_open API. Visible behaviour unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

init.lua

@@ -66,7 +66,10 @@ local state = (function()
         },
         dirty           = false,
         picker_open     = false,            -- atlas+tile picker expanded? (legacy 0.1.0)
-        cheatsheet_open = false,            -- 0.2.0a: ?-modal toggled?
+        menu_open         = nil,            -- 0.3.0: nil | <category_name> (e.g. "File")
+        modal_open        = nil,            -- 0.3.0: nil | <modal_id>     (single-stack)
+        show_layers_panel = true,           -- 0.3.0: Window > Layers Panel toggle
+        show_palette      = true,           -- 0.3.0: Window > Palette toggle
         mouse_cell      = nil,              -- {x, y} or nil if mouse off-map
         snap_vertex     = nil,              -- 0.2.0b: {vx, vy} or nil (auto-tile mode snap target)
         drag_paint      = nil,              -- 0.2.0c.1: nil | "paint" | "erase" (active drag-stroke mode)
@@ -136,11 +139,23 @@ local state = (function()
         state.mode = (state.mode == "auto-tile") and "direct" or "auto-tile"
     end
 
-    -- 0.2.0a: ?-modal cheatsheet visibility.
+    function M.is_modal_open(id)
-    function M.is_cheatsheet_open()    return state.cheatsheet_open end
+        if id == nil then return state.modal_open ~= nil end
-    function M.toggle_cheatsheet()
+        return state.modal_open == id
-        state.cheatsheet_open = not state.cheatsheet_open
     end
+    function M.open_modal(id)           state.modal_open = id end
+    function M.close_modal()            state.modal_open = nil end
+    function M.get_modal_open()         return state.modal_open end
+
+    function M.set_menu_open(name)      state.menu_open = name end
+    function M.get_menu_open()          return state.menu_open end
+    function M.close_menu()             state.menu_open = nil end
+
+    function M.is_layers_panel_shown()  return state.show_layers_panel end
+    function M.toggle_layers_panel()    state.show_layers_panel = not state.show_layers_panel end
+
+    function M.is_palette_shown()       return state.show_palette end
+    function M.toggle_palette()         state.show_palette = not state.show_palette end
 
     function M.set_mouse_cell(x, y)
         if x == nil then
@@ -181,10 +196,13 @@ local state = (function()
         state.roof_mode = false
         state.dirty = false
         state.picker_open = false
-        state.cheatsheet_open = false
         state.mouse_cell = nil
         state.snap_vertex = nil
         state.drag_paint = nil
+        state.menu_open         = nil
+        state.modal_open        = nil
+        state.show_layers_panel = true
+        state.show_palette      = true
         state.debug_overlay = false
         state.world_overlay = true
         for name in pairs(state.layer_visible) do
@@ -310,7 +328,8 @@ local actions = (function()
     -- 0.2.0a actions
     function M.toggle_mode()       state.toggle_mode() end
     function M.set_mode(m)         state.set_mode(m) end
-    function M.toggle_cheatsheet() state.toggle_cheatsheet() end
+    function M.open_cheatsheet()  state.open_modal("cheatsheet") end
+    function M.close_modal()      state.close_modal() end
 
     -- 0.2.0c actions
     function M.toggle_flip()       state.toggle_flip() end
@@ -724,7 +743,7 @@ local ui = (function()
     end
 
     local function draw_cheatsheet(mx, my)
-        if not state.is_cheatsheet_open() then return end
+        if state.get_modal_open() ~= "cheatsheet" then return end
         local c = cheatsheet_layout()
         -- Dim the whole screen behind the modal
         local screen_w, screen_h = engine.window.size()
@@ -843,19 +862,13 @@ local ui = (function()
         elseif id == "rotate"  then actions.cycle_rotation()
         elseif id == "flip"    then actions.toggle_flip()
         elseif id == "reset_xform" then actions.reset_transform()
-        elseif id == "help"    then actions.toggle_cheatsheet()
+        elseif id == "help"    then actions.open_cheatsheet()
         end
     end
 
     -- Hit-test mouse click. Returns true if the click was consumed by UI.
     -- button: "left" | "right"
     function M.handle_click(mx, my, button)
-        -- Cheatsheet modal absorbs all clicks while open (any click closes it)
-        if state.is_cheatsheet_open() then
-            actions.toggle_cheatsheet()
-            return true
-        end
-
         -- Top toolbar buttons
         for _, b in ipairs(toolbar_buttons_layout()) do
             if in_rect(mx, my, b.x, b.y, b.w, b.h) then
@@ -1004,7 +1017,7 @@ function update(ctx, dt)
         actions.toggle_mode()
     end
     if input.was_action_pressed("toggle_cheatsheet") then
-        actions.toggle_cheatsheet()
+        if state.is_modal_open("cheatsheet") then actions.close_modal() else actions.open_cheatsheet() end
     end
 
     -- 0.2.0c hotkeys: transform controls (Direct-mode override paint)