adds full longform highlight support. signed by npub1zafcms4xya5ap9zr…

[alltheseas]

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Summary

Added full longform highlight support by allowing creation of longform highlights, and rendering source of longform highlights, and allowing navigation to highlight source by tapping on the highlight or source link.

Checklist

• [ ] I have read (or I am familiar with) the Contribution Guidelines
• [x] I have tested the changes in this PR
• [x] I have opened or referred to an existing github issue related to this change. Closes https://github.com/damus-io/damus/issues/3255.
• [x] My PR is either small, or I have split it into smaller logical commits that are easier to review
• [x] I have added the signoff line to all my commits. See Signing off your work
• [ ] I have added appropriate changelog entries for the changes in this PR. See Adding changelog entries
  • [ ] I do not need to add a changelog entry. Reason: [Please provide a reason]
• [ ] I have added appropriate Closes: or Fixes: tags in the commit messages wherever applicable, or made sure those are not needed. See Submitting patches

Test report

Please provide a test report for the changes in this PR. You can use the template below, but feel free to modify it as needed.

Device: xcode simulator iPhone 17 Pro

iOS: iOS 26

Damus: 1.15 (1) f2870b9a

Setup: _ xcode simulator_

Steps: [Please provide a list of steps you took to test the changes in this PR]

Results:

• [X] PASS
• [ ] Partial PASS
  • Details: [Please provide details of the partial pass]

Other notes

[Please provide any other information that you think is relevant to this PR.]

[alltheseas]

create longform highlight in iOS Damus screenshot

view longform highlight in iOS Damus screenshot

verify in third party nostr app longform highlight

[alltheseas]

this PR also adds claude.md file that should assist with agent coding for future PRs

[alltheseas]

received feedback that there are hundreds of unnecessary files, unnecessarily large PR size from iOS devs. investigating.

[alltheseas]

this PR https://github.com/damus-io/damus/pull/3276/ should remove all the unnecessary artifacts. I confirmed that https://github.com/damus-io/damus/pull/3276/ allows me to successfully create and read longform highlights on my physical device.