feat: Implement initial Sprite Editor application with basic UI components

- Added main application class `SpriteEditorApp` with layout setup.
- Created menu bar with placeholder options.
- Implemented `BottomToolbarView`, `LeftSidebarView`, `MainEditorView`, `RightSidebarView` with basic UI elements.
- Added dialog classes for `ExportSettingsDialog` and `FlipbookCreatorDialog` to manage export settings and flipbook creation.
- Introduced support for loading and displaying images in the flipbook creator.
- Established a structure for handling sprite sheet composition and preview rendering.

views/menu_bar.py

@@ -0,0 +1,32 @@
+import tkinter as tk
+
+
+def create_menu_bar(root: tk.Tk, on_open_flipbook_creator=None) -> None:
+    menu_bar = tk.Menu(root)
+
+    file_menu = tk.Menu(menu_bar, tearoff=0)
+    file_menu.add_command(label="New (Placeholder)")
+    file_menu.add_command(label="Open (Placeholder)")
+    file_menu.add_command(label="Save (Placeholder)")
+    file_menu.add_separator()
+    file_menu.add_command(label="Exit", command=root.quit)
+    menu_bar.add_cascade(label="File", menu=file_menu)
+
+    edit_menu = tk.Menu(menu_bar, tearoff=0)
+    edit_menu.add_command(label="Undo (Placeholder)")
+    edit_menu.add_command(label="Redo (Placeholder)")
+    menu_bar.add_cascade(label="Edit", menu=edit_menu)
+
+    view_menu = tk.Menu(menu_bar, tearoff=0)
+    view_menu.add_command(label="Zoom In (Placeholder)")
+    view_menu.add_command(label="Zoom Out (Placeholder)")
+    menu_bar.add_cascade(label="View", menu=view_menu)
+
+    tools_menu = tk.Menu(menu_bar, tearoff=0)
+    if on_open_flipbook_creator is None:
+        tools_menu.add_command(label="Flipbook Creator", state=tk.DISABLED)
+    else:
+        tools_menu.add_command(label="Flipbook Creator", command=on_open_flipbook_creator)
+    menu_bar.add_cascade(label="Tools", menu=tools_menu)
+
+    root.config(menu=menu_bar)