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feat(chat): open message links on the linked message - #1055

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feat/message-link-route
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bmc08gt wants to merge 4 commits into
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feat/message-link-route

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@bmc08gt bmc08gt commented Oct 14, 2026

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https://app.flipcash.com/chat/{chatId}/m/{seq} opened the chat at the bottom: Route parsed it as .chat(id) and dropped the message. This is task A of the message-links design (route and land); the message card follows in a stacked PR.

  • Route parses /m/{seq} to .chatMessage(id, MessageID(value: seq)). A non-numeric seq falls back to .chat(id), as before.
  • DeepLinkAction routes it through routeChat to a new .chatMessage(id, MessageLanding) destination, the same ConversationScreen with a landing. A private group the viewer isn't in still opens its profile.
  • Landing reuses the reply jump (scrollToMessage → flashAttention). When the message isn't stored, MessageLoader.revealPaging pages older history back from the oldest stored message until it is, up to 20 pages. Paging back keeps the window contiguous; a page fetched around the target would leave a hole, because the window reads forward from its anchor.
  • A link to the chat that's already open jumps in place rather than remounting it.
  • A link tapped in another chat shows a back chip under the bar (36pt, radius 18, white 12% fill; node 11493:212). It returns to the source chat and hides when the user drags the transcript or sends.
  • The scan allowlist accepts the new route. LinkCardClassifier sends it to the group card until the message card lands.

On the simulator, flipcash://chat/<Jeffy group>/m/150 with messages 315–364 stored paged back to 115 and landed on 150; a second link to 62, while that chat was open, paged back to 15 and landed on 62.

Known limits:

  • A message more than 20 pages back gets the "Message Unavailable" dialog, which says it may have been deleted.
  • loadOlderMessages returns early when canRead is false, so a viewer whose transcript is obscured by the gate can only land inside the initial window.

`/chat/{id}/m/{seq}` parsed as `.chat(id)` and dropped the message, so a
message link opened the chat at the bottom. It now parses to
`.chatMessage(id, seq)` and routes through `routeChat` to a sibling
destination that carries the message.

The transcript lands with the reply jump's scroll-and-flash. When the
message isn't stored locally, `MessageLoader.revealPaging` pages older
history back from the oldest stored message until it is, capped at 20
pages, so the window stays contiguous. A link to the open chat jumps in
place instead of remounting it.

A link tapped in another chat shows a back chip under the bar that
returns there. It hides when the user drags the transcript or sends.

A malformed `/m/` segment falls back to `.chat(id)`. A private group the
viewer isn't in still opens its profile. The scan allowlist and the
link-card classifier accept the new route; the classifier keeps the
group card until the message card lands.
A link to a message older than the first page landed with the target as
the window's first row, half under the top edge, because `reveal`
anchored the window on the target itself. It now anchors 12 messages
earlier where history allows, and `revealPaging` fetches one more page
when the page it stopped on begins at the target.

`MessageLinkSmokeTests` opens `/chat/{id}/m/100` in the XCTests tip DM,
whose first page holds 251-300, and waits for the highlighted row to be
on screen. The row a jump lands on carries the `chat-attention-target`
accessibility identifier while the flash runs, so the test can find it.
* commit '16a24ad1eb3eeac2097eac72d32150ba2c368f18':
  fix(ui): draw UIKit caption in Avenir Medium like SwiftUI (#1064)
  fix(members): host chip and member count label to match Android (#1058)
  chore(chat): log the attach lifecycle the same way in both hosts (#1062)
  refactor(chat): decide attach close events in one place (#1061)
  refactor(chat): measure the attach card's frame once (#1060)
  refactor(chat): read the attach menu rows live over the keyboard (#1059)
  refactor(chat): build the attach actions once for both hosts (#1056)
  fix(chat): render system messages in the transcript (#1054)

# Conflicts:
#	Flipcash/Core/Screens/Conversation/ChatScreenRepresentable.swift
It used a flat 12% white fill. On iOS 26 it now takes the same interactive
glass as the composer; older iOS keeps the fill and hairline border.
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