[westernCasa]

M18 smart capture on the phone. Only mobile/ changes.

What it does

• Capture in the browser's bottom bar saves the current page into the trail being recorded:
  • address and title
  • DOI or PMID, if the page has one. It checks citation metadata first, then the address, doi.org links and the page text.
  • the time with the time zone
  • the selected text, or the last text you selected on that page
  • a thumbnail
• It becomes a capture card linked "captured from" the page's card, the same as desktop captureCard. The page becomes a card too, since a capture counts as engagement (B104).
• The screen doesn't change. A note says where the capture went ("Captured to Sourdough · with the selected text · DOI found") and offers Undo. Undo also removes the page card if the capture created it and no other capture uses it.
• Sign-in, account and payment pages are refused.
• The card preview shows the thumbnail, the capture line with the time zone, and Open DOI / PubMed buttons.
• In a shared .trail.md, the capture keeps its quote and the line "Captured from nature.com · phone 14:02 GMT-5 · DOI 10.1038/…". Thumbnails stay on the phone.
• To fit five buttons on a phone screen, the bottom bar now reads Suggest, Capture, Mosaic, Trail and ⚙︎.

New module: react-native-view-shot 6.1.1 (the SDK 58 version, included in Expo Go).

Not in this PR (needs a development build or more work)

• Capturing from the system share sheet, or from a long-press menu on selected text.
• Voice notes on captures.
• Thumbnail files are not yet deleted when a trail is deleted.

Checks

• npm test in mobile/: 11 passed (6 trail and 5 capture tests). They cover DOI cleaning (URL-encoded, trailing punctuation, brackets), metadata order, PMIDs, refused pages, cards and links, Undo, and the shared-file round trip.
• bundle:check: iOS and Android bundles build.
• expo-doctor (offline): 18/20. The 2 failures need the network, as before.
• Not yet tried on a phone.

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