New command `photo.renderToDng` (Photo menu): each selected photo (at most
500) is rendered with its edits as a linear 16-bit float DNG
`<name>-Rendered.dng` next to its original (never overwriting; a demo photo
needs `dir`), added to the library stacked on top of the original, and the new
photos are selected. Colour space proPhoto by default (rec2020, adobeRgb,
displayP3, srgb). A batch holds a cancellable `renderDng` activity row with
progress; cancelling stops between photos and keeps the copies made so far;
a failing photo in a batch is listed and the rest carry on.
Stacked on #1047.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Rebased onto the activity stack (#601). An export adding its files to
Photos keeps its row through that step, with "Adding to Apple Photos…" as
the detail. The worker turns the row's ✕ off (TaskHandle::set_cancellable)
before its last look at the cancel flag and reports what it saw, so a
cancel either stops the export before Photos is asked or is refused, never
both "cancelled" and imported. activity: a per-task gate orders a cancel's
decision against a step switching cancelling off, so a cancel can't be
accepted between the switch and the step's look at the flag and then be
ignored. An import of its own (export.addToPhotos, or
the Photos step left running after a foreground app.export) holds a row of
kind applePhotos while Photos works: no ✕, no count, the album as detail.
The desktop app refuses export.addToPhotos {wait: true}: its window's
thread never waits for Photos. The label is in every catalog; tests assert
the rows, the refused cancel and the refused wait.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A registry of the background tasks in flight on Session: a job holds a
TaskGuard while it runs (dropping it, also during a panic unwind, removes
the row), adopts its existing cancel flag, and reports done/total in a
unit the frontend words. Groundwork for one progress stack for imports,
exports, preview builds and the other long jobs.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
