Paka 0.15.0 capture preview 2

Second preview of 0.15.0, adding photo cropping and better capture focus on top of capture preview 1.

• Crop a captured photo before it is saved: a scanner-style corner frame you drag by its corners or move as a whole, with the area outside dimmed. Cropping happens entirely in memory before encryption; the uncropped bytes are zeroed once replaced
• The capture screen now keeps nudging centre focus on the scanner's retry cadence, so close-up documents (IDs, cards) settle without repeated manual taps — a tap-to-focus still takes priority
• Also in this preview (from capture preview 1): take document photos directly inside Paka with no gallery entry or temporary file and metadata stripped, and reorder passes within a stack from a pass's Details

Worth testing on the device: whether the auto-focus retry helps or fights close-up framing, the crop frame's feel on the small screen, and the two-shot front/back flow with a crop on each.

Signed like the regular releases, so it installs as an update over an existing Paka installation (including earlier previews). Source is on the preview/document-capture branch; main remains at 0.14.0.