In-game campaign, map and block script editors

Mission graph with branches, mission settings and goals, map editor on the
3D view (terrain, places, units, towers, traps, forts, rivals, zones; undo,
brush, rectangle, fill, mirror), block editor with palette, nesting, live
problems, undo, copy/paste and search; test play with a script debug view;
demo campaign and built-in missions as templates.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/menu.rs

@@ -291,6 +291,7 @@ enum Btn {
     BestPick(usize),
     BestLevel(i32),
     LangOpen, // the language dropdown field
+    BackToEditor,
 }
 
 pub const REPO_URL: &str = "https://git.familie-zink.org/zink/dungeoncraft";
@@ -376,6 +377,7 @@ pub enum MenuAction {
     CampaignStart(usize),
     OpenRepo,
     OpenClaudeCode,
+    BackToEditor,
     OpenOpenCode,
     Login(String, String),
     Logout,
@@ -412,6 +414,7 @@ pub struct Menu {
     pub match_ui: MatchUi,       // copied state of the multiplayer relay, shown on the Match page
     pub coop_mission: usize,     // co-op campaign mission selected on the Match page
     pub in_match: bool,          // a match is being played; the pause menu changes its shape
+    pub editor_test: bool,       // a mission of the editor is being tested: back to the editor
     pub campaign_doc: CampaignDoc,
     pub campaign_selected: usize,
     pub campaign_pending: bool,
@@ -447,6 +450,7 @@ impl Menu {
             match_ui: MatchUi::default(),
             coop_mission: crate::campaign::coop_mission_indexes().first().copied().unwrap_or(0),
             in_match: false,
+            editor_test: false,
             campaign_doc: CampaignDoc::default(),
             campaign_selected: 0,
             campaign_pending: false,
@@ -699,6 +703,7 @@ impl Menu {
             Some(Btn::Repo) => MenuAction::OpenRepo,
             Some(Btn::ClaudeCode) => MenuAction::OpenClaudeCode,
             Some(Btn::OpenCode) => MenuAction::OpenOpenCode,
+            Some(Btn::BackToEditor) => MenuAction::BackToEditor,
             Some(Btn::Field(i)) => {
                 self.focus = i;
                 if matches!(self.page, Some(Page::Match { .. })) {
@@ -1109,6 +1114,9 @@ impl Menu {
         let sw = sw();
         let sh = sh();
         let mut items = vec![(Btn::Resume, tr("menu.resume"))];
+        if self.editor_test {
+            items.push((Btn::BackToEditor, tr("menu.back_editor")));
+        }
         if self.mission.is_some() {
             items.push((Btn::Goals, tr("menu.goals")));
         }