refactor(map-editor): retire legacy toolbar

Removes the eight-button top toolbar, its layout helpers, click
dispatcher and all TOOLBAR_* constants. Side-panel and palette
offsets now anchor to MENU_BAR_H. Mode-pill no longer overlaps a
parallel toolbar element.

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

init.lua

@@ -374,7 +374,7 @@ local ui = (function()
     -- =====================================================================
     -- Layout constants
     -- =====================================================================
-    -- Menu bar (replaces TOOLBAR_H block in v0.3.0)
+    -- Menu bar
     local MENU_BAR_H           = 24
     local MENU_LABEL_PAD_X     = 12
     local MODE_PILL_W          = 130
@@ -391,13 +391,6 @@ local ui = (function()
     local DROPDOWN_MIN_W       = 180
     local DROPDOWN_PAD_X       = 10
 
-    -- Top toolbar (full-width, mode-switch + action buttons)
-    local TOOLBAR_H            = 32
-    local TOOLBAR_BUTTON_W     = 88
-    local TOOLBAR_BUTTON_H     = 24
-    local TOOLBAR_BUTTON_GAP   = 6
-    local TOOLBAR_PADDING      = 4
-
     -- Side panel (right edge, layers vis + active)
     local SIDE_PANEL_W         = 160
     local LAYER_ROW_H          = 22
@@ -592,19 +585,6 @@ local ui = (function()
         { name = "Help",   items = HELP_ITEMS   },
     }
 
-    -- Top-toolbar buttons (left-to-right). Action ids dispatched in
-    -- handle_click; hotkey labels rendered on the button face.
-    local TOOLBAR_BUTTONS = {
-        { id="mode_auto",   label="Auto-Tile",   hotkey="Tab",  group="mode" },
-        { id="mode_direct", label="Direct",      hotkey="Tab",  group="mode" },
-        { id="save",        label="Save",        hotkey="S" },
-        { id="erase",       label="Erase",       hotkey="E" },
-        { id="rotate",      label="Rotate",      hotkey="R" },
-        { id="flip",        label="Flip",        hotkey="H" },
-        { id="reset_xform", label="Reset",       hotkey="0" },
-        { id="help",        label="Help",        hotkey="I" },
-    }
-
     -- Cheatsheet content (rendered into the modal).
     local CHEATSHEET = {
         { key="Tab",   action="Toggle mode (Auto-Tile / Direct)" },
@@ -667,30 +647,6 @@ local ui = (function()
     -- resize robustness — engine.window.size() is cheap).
     -- =====================================================================
 
-    local function toolbar_layout()
-        local screen_w = engine.window.size()
-        return { x = 0, y = 0, w = screen_w, h = TOOLBAR_H }
-    end
-
-    -- Returns array of { id, label, hotkey, group, x, y, w, h } for each
-    -- toolbar button, packed left-to-right within the toolbar rect.
-    local function toolbar_buttons_layout()
-        local out = {}
-        local x = TOOLBAR_PADDING
-        local y = (TOOLBAR_H - TOOLBAR_BUTTON_H) / 2
-        for i, b in ipairs(TOOLBAR_BUTTONS) do
-            out[i] = {
-                id     = b.id,
-                label  = b.label,
-                hotkey = b.hotkey,
-                group  = b.group,
-                x = x, y = y, w = TOOLBAR_BUTTON_W, h = TOOLBAR_BUTTON_H,
-            }
-            x = x + TOOLBAR_BUTTON_W + TOOLBAR_BUTTON_GAP
-        end
-        return out
-    end
-
     -- 0.3.0: Mode-pill anchored to the right end of the menu bar.
     local function mode_pill_layout()
         local screen_w = engine.window.size()
@@ -894,9 +850,9 @@ local ui = (function()
         local screen_w, screen_h = engine.window.size()
         return {
             x = screen_w - SIDE_PANEL_W,
-            y = TOOLBAR_H,
+            y = MENU_BAR_H,
             w = SIDE_PANEL_W,
-            h = screen_h - TOOLBAR_H - PALETTE_H,
+            h = screen_h - MENU_BAR_H - PALETTE_H,
         }
     end
 
@@ -1125,47 +1081,6 @@ local ui = (function()
     -- Drawing
     -- =====================================================================
 
-    -- Decide whether a toolbar button is in the "active" highlighted
-    -- state — only mode-group buttons match the current mode.
-    local function button_is_active(b)
-        if b.group ~= "mode" then return false end
-        if b.id == "mode_auto"   and state.get_mode() == "auto-tile" then return true end
-        if b.id == "mode_direct" and state.get_mode() == "direct"    then return true end
-        return false
-    end
-
-    local function draw_button(b, mx, my)
-        local is_active = button_is_active(b)
-        local is_hover  = in_rect(mx, my, b.x, b.y, b.w, b.h)
-        local bg = is_active and COL_BUTTON_BG_ACTIVE
-                or is_hover  and COL_BUTTON_BG_HOVER
-                or COL_BUTTON_BG
-        local text_col = is_active and COL_TEXT_ACTIVE or COL_TEXT
-        engine.render.draw_rect(b.x, b.y, b.w, b.h, rgba(bg, 0xFF))
-        if is_active then
-            engine.render.draw_rect_lines(b.x, b.y, b.w, b.h, rgba(COL_BUTTON_BORDER, 0xFF))
-        end
-        engine.render.draw_text(b.label, b.x + 6, b.y + 4, 12, rgba(text_col, 0xFF))
-        if b.hotkey then
-            engine.render.draw_text("(" .. b.hotkey .. ")", b.x + 6, b.y + 14, 9,
-                rgba(text_col, 0xC0))
-        end
-    end
-
-    local function draw_top_toolbar(mx, my)
-        local t = toolbar_layout()
-        engine.render.draw_rect(t.x, t.y, t.w, t.h, rgba(COL_TOOLBAR_BG, 0xFF))
-        for _, b in ipairs(toolbar_buttons_layout()) do
-            draw_button(b, mx, my)
-        end
-        -- Mode + active-layer label in the toolbar's right area
-        local label = string.format("Mode: %s   Layer: %s",
-            state.get_mode(), state.get_active_layer())
-        local screen_w = engine.window.size()
-        engine.render.draw_text(label, screen_w - SIDE_PANEL_W - 240, 10, 12,
-            rgba(COL_TEXT_MUTED, 0xFF))
-    end
-
     local function draw_side_panel(mx, my)
         local p = side_panel_layout()
         engine.render.draw_rect(p.x, p.y, p.w, p.h, rgba(COL_PANEL_BG, 0xFF))
@@ -1278,7 +1193,6 @@ local ui = (function()
                 end
             end
         end
-        draw_top_toolbar(mx, my)
         draw_mode_pill()
         if state.is_layers_panel_shown() then
             draw_side_panel(mx, my)
@@ -1371,21 +1285,6 @@ local ui = (function()
         end
     end
 
-    -- Dispatch a toolbar-button click to the appropriate action.
-    local function dispatch_toolbar_button(id)
-        if id == "mode_auto"   then actions.set_mode("auto-tile")
-        elseif id == "mode_direct" then actions.set_mode("direct")
-        elseif id == "save"    then actions.save()
-        elseif id == "erase"   then
-            local cell = state.get_mouse_cell()
-            if cell then actions.erase_cell_at(cell.x, cell.y) end
-        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.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)
@@ -1483,16 +1382,6 @@ local ui = (function()
             state.close_menu()
         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
-                if button == "left" then
-                    dispatch_toolbar_button(b.id)
-                end
-                return true
-            end
-        end
-
         -- Bottom palette swatches: left = select slot
         if state.is_palette_shown() then
             for _, sw in ipairs(palette_swatches_layout()) do