Merge remote-tracking branch 'upstream/main' into feat/system-appearance

# Conflicts:
#	crates/ui-egui/locales/de.json
#	crates/ui-egui/locales/es.json
#	crates/ui-egui/locales/ja.json
#	crates/ui-egui/locales/pt-br.json
#	crates/ui-egui/locales/ru.json
#	crates/ui-egui/locales/zh-hans.json
#	crates/ui-egui/locales/zh-hant.json
#	docs/whats-new.md

docs/control-protocol.md

@@ -30,7 +30,7 @@ mode ([mcp.md](mcp.md)) is a thin layer over this channel. Implementation:
 | `engine.commands` | — | Engine + UI commands: id, label, menu, shortcut, params doc, enabled |
 | `ui.menu.list` | — | Menu entries (flat: id, label, menu path, shortcut, enabled) |
 | `ui.menu.tree` | — | The menu bar as shown (File … Help): items `{id, params?, label, shortcut?, enabled, checked?}`, separators, submenus — the model behind the native macOS menu bar and the in-window menus |
-| `ui.inspect` | — | UI state, window, `loupe` (`source`, and `region: {full, window, pending}` when a zoomed view also renders the window on screen at no more than 100 % — `full` is the frame it is cut from, `window` its `[x, y, w, h]` — and `regionBefore` for the Before side of a Before/After view), canvas/image rects, `scroll: {grid, filmstrip}` (scroll offsets in points, `null` until drawn), active photo, selection, perf (`frameMs` = layout, `logicMs` = per-frame logic before it, `updateMs` = both, `maxUpdateMs`, `fps`, render queue …, `gpu` = adapter in use, `gpuReason` = why renders don't use the GPU, `gpuFallback` = latest render redone on the CPU and why — see `docs/gpu-pipeline.md`), status, memory (bytes per cache, see `library.memory`; plus stage caches — `budgetBytes`, `trimmed`, `sharedSourceBytes` (the one device copy of a big original) — and textures), `export: {running: {total, done, current} \| null, last}`, `notices` (warnings waiting to be shown, e.g. a damaged settings file; OK = `button:noticeOk`), `quitPrompt` (why quitting was stopped: unsaved changes; `button:quitRetry` / `button:quitAnyway` / `button:quitCancel`), `import: {done, total, imported, cancelled} \| null` (an import runs on a worker thread), `tasks` (other background work: `Find Missing Photos`, `Auto Import`), `fileDialogs` (commands waiting on a native file dialog, which runs off the UI thread; they run again with the answer when it closes), `copied` (the text the UI last put on the clipboard, `null` until something is copied) |
+| `ui.inspect` | — | UI state, window, `loupe` (`source`, and `region: {full, window, pending}` when a zoomed view also renders the window on screen at no more than 100 % — `full` is the frame it is cut from, `window` its `[x, y, w, h]` — and `regionBefore` for the Before side of a Before/After view), canvas/image rects, `scroll: {grid, filmstrip}` (scroll offsets in points, `null` until drawn), active photo, selection, perf (`frameMs` = layout, `logicMs` = per-frame logic before it, `updateMs` = both, `maxUpdateMs`, `fps`, render queue …, `gpu` = adapter in use, `gpuReason` = why renders don't use the GPU, `gpuFallback` = latest render redone on the CPU and why — see `docs/gpu-pipeline.md`), status, memory (bytes per cache, see `library.memory`; plus stage caches — `budgetBytes`, `trimmed`, `sharedSourceBytes` (the one device copy of a big original) — and textures), `export: {running: {total, done, current} \| null, last}`, `notices` (warnings waiting to be shown, e.g. a damaged settings file; OK = `button:noticeOk`), `quitPrompt` (why quitting was stopped: tasks that would be cut short are running — `button:quitAnyway` cancels them and quits, `button:quitCancel` keeps working — or unsaved changes: `button:quitRetry` / `button:quitAnyway` / `button:quitCancel`), `import: {done, total, imported, cancelled} \| null` (an import runs on a worker thread), `tasks` (other background work: `Find Missing Photos`, `Auto Import`), `activity` (every long-running task in flight as the activity stack in the top-left corner shows it, same shape as `activity.list`; a row appears once its task is 0.5 s old, ids `activity:row:<id>`, ✕ = `activity:cancel:<id>`, `activity:more` expands past 3 rows), `fileDialogs` (commands waiting on a native file dialog, which runs off the UI thread; they run again with the answer when it closes), `copied` (the text the UI last put on the clipboard, `null` until something is copied) |
 | `ui.widgets` | `{filter?}` | On-screen widgets `{id, rect: [x, y, w, h]}` (screen points) |
 | `ui.clickWidget` / `ui.dragWidget` / `ui.hoverWidget` | `{id, count?, button?, fx?, fy?}` (`button: "right"` right-clicks) / `{id, toX?, toY?, dx?, dy?, steps?}` / `{id, fx?, fy?}` | Real egui input on a widget (hover: the pointer rests on it, e.g. for preset/profile previews) |
 | `ui.move` / `ui.click` / `ui.drag` | `{x, y, count?, button?}` / `{x, y, toX, toY, steps?}` | Raw pointer input, screen points |
@@ -46,6 +46,8 @@ mode ([mcp.md](mcp.md)) is a thin layer over this channel. Implementation:
 | `ui.zoomFactor` | `{factor}` | Set the interface scale (0.5–3; egui's zoom keys are off, Cmd+= / Cmd+- zoom the photo) |
 | `ui.screenshot` | `{path?, headless?}` | `{path, width, height}` once the frame (with finished renders) is captured. `headless: true` draws the UI on the CPU (no compositor needed); a windowed capture that gets no frame within 2 s falls back to headless automatically |
 | `engine.execute {command: "app.export", params}` | export params (see `docs/mcp.md`), plus `preset`, `dir` / `path`, `ids`, `background` | Writes the files and returns `{files}`; with `background: true` (what the Export dialog and menus use) it returns `{background: true, total}` at once and the batch runs on a worker thread — poll `ui.inspect` → `export` |
+| `engine.execute {command: "activity.list"}` | — | The long-running tasks in flight (imports, exports, preview builds, downloads, the face scan…), oldest first: `{tasks: [{id, kind, label, done, total, unit, detail, cancellable, cancelling, ageMs}]}`; `total` 0 = not known yet; `unit` is `count`, `bytes` or `percent`; `label` is English (the app shows it translated) |
+| `engine.execute {command: "activity.cancel"}` | `{id}` or `{all: true}` | Asks the task (or every cancellable one) to stop at its next file or photo → `{cancelled: n}`; an unknown id (it may have just finished) or a task that can't be cancelled is an error |
 | `ui.render` | `{id?, size?, path?}` | Render a photo (PNG to `path`), `{width, height}` |
 | `app.quit` | — | Close the app |