refactor: Simplify card shortcuts and enhance card control in editor

- Removed individual card shortcuts for dungeon and graphics categories to prevent hash table overflow, consolidating functionality into a Card Browser.
- Introduced a context-sensitive card control feature that dynamically displays relevant cards based on the active editor.
- Updated PaletteEditor to clarify its use of internal tabs instead of separate cards.
- Registered multiple cards in MessageEditor and OverworldEditor, improving visibility and management of editor functionalities.

src/app/editor/graphics/palette_editor.cc

@@ -186,7 +186,11 @@ absl::Status DisplayPalette(gfx::SnesPalette& palette, bool loaded) {
   return absl::OkStatus();
 }
 
-void PaletteEditor::Initialize() {}
+void PaletteEditor::Initialize() {
+  // PaletteEditor uses tabs within a single window, not separate cards
+  // So we don't register individual cards - the whole editor is one unit
+  printf("[PaletteEditor] No cards to register (uses internal tabs)\n");
+}
 
 absl::Status PaletteEditor::Load() {
   gfx::ScopedTimer timer("PaletteEditor::Load");