editor: game running badge and stop game button during play-tests, crosshair for play from camera position while shift is held, readable outliner names, plain error dialogs with details and no stuck loading status, inspector hints wrap with the dock

notes/editor-ui.md

@@ -113,7 +113,9 @@ same id again replaces (panels, tools, actions, asset tabs, layers).
 | `LevelTemplate` | `fill(Scene)` adds nodes directly (no undo) before the editor shows the new level |
 | `LevelCheck` | adds `Problem.error/warning/info(msg, node)`; errors block Build/Play |
 | `Icons` | vector icons by name; `Icons.register(name, painter)` for your own (16×16 Java2D); `Icons.swatch(colour, w, h)` |
-| `Widgets`, `util.SwingListeners` | `Widgets.button(text, icon, tip, run)`, `Widgets.listCell(c, list, selected)`; `onTextChange`, `onMenuOpen` |
+| `Widgets`, `util.SwingListeners` | `Widgets.button(text, icon, tip, run)`, `Widgets.listCell(c, list, selected)`, `Widgets.wrappingLabel(html)` (help text that wraps at the dock width – use it instead of `<body style='width:…'>`); `onTextChange`, `onMenuOpen` |
+| `ErrorDialog` | `ctx.error(title, t)` uses it: plain sentence (`ErrorDialog.plain(t)`, no exception class names) + collapsible **Details** (stack trace) |
+| Game state | `ctx.setGameRunning(what, stop)` (default no-op): while a play-test game runs the status bar shows "Game running: what" and the toolbar Play button becomes **Stop game** (runs `stop`); `null` resets. `PlaytestRunner` sets it on launch and clears it when its watcher sees the game exit |
 | `AssetDrop` | `register(kind, handler)`; `dragSource(list, value → payload(kind, data))` makes a list draggable into the viewport |
 | `EditorPrefs` | `ctx.prefs()` JSON settings in `<data>/editor/settings.json`; prefix your keys |
 | `NodeCopy` | duplicate/snapshot nodes (fresh ids) |
@@ -124,6 +126,7 @@ game space (`ToolEvent.toGame` / `toExport`). Drop/placement points: `ctx.ground
 
 ### Render additions used by tools (backwards compatible, `editor.render`)
 
+`Viewport.setHudOverlay(pixels)` (second pixel overlay independent of the tool, e.g. the Shift+F5 crosshair),
 `Viewport.setInput(ViewportInput)` (tool hook: left-button press/drag/release not on the gizmo, moves,
 keys), `setToolOverlay(depthTested, onTop)`, `setScreenOverlay(pixels)` (marquee), `unproject(x, y,
 depth)` public, `isFlying()`, `canvas()`; `RenderScene.overlaysChanged()`; `LevelSceneAdapter.mesh/page/collision`
@@ -157,7 +160,8 @@ public; invisible tile instances are no longer baked into chunks; `History.undoL
   3; backup first) unlocked up to the level if needed and map cursor on it → start the game.
 * **Boot to level** (phase 3, `editor.tools.playtest`, `notes/editor-playtest.md`): Play now also
   applies the exe mod `boot-to-level`, so the game loads the level directly (no menus) and Escape
-  quits; Shift+F5 = play from the camera position. The old menu-based run is still available
+  quits; Shift+F5 = play from the camera position (holding Shift or hovering the action shows a green/red
+  crosshair at that point). While the game runs: "Game running" badge + **Stop game** button (see Game state). The old menu-based run is still available
   (Level → *Play boots straight into the level* off).
   `-Dllamamod.editor.noLaunch=true` skips the launch (tests start the game through apptest).