v0.2.0 — Consistency parity, video probing

Since 0.1.0

Consistency-mask / optical-flow parity fix. Corrections to the consistency and flow
handling from the cc-parity work, with tests. The processed consistency mask is now a
selectable layer in the History & Comparison view.

Video probing on input. Selecting an input video reads it on the spot (ffprobe, with an
OpenCV fallback) and shows the source metadata, a first-non-black-frame thumbnail, and — the
point — the exact render size and frame count the run will produce, rather than an
estimate. The frame range is clamped to what the clip actually contains.

Patreon + supporters. A Sponsor button (.github/FUNDING.yml) and a supporters credit
in the render monitor, shown only until the first frame of a session renders.

26 files changed. Full diff: v0.1.0...v0.2.0