feat(channel): URL search params for single channel navigation

[gbirman]

uses search params to navigate in a channel when there's a single split

[coderabbitai]

📝 Walkthrough

Walkthrough

Modified NewChannelBlockAdapter to compute initial ChannelTargetMessageParams through a new initialTargetMessageParams() function. The logic prioritizes URL parameters from props, then conditionally uses URL search parameters only when exactly one split exists; otherwise defaults to empty parameters.

Changes

Cohort / File(s)	Summary
Initial Target Message Parameters Computation js/app/packages/block-channel/component/NewChannelBlockAdapter.tsx	Added globalSplitManager import and introduced initialTargetMessageParams() function to conditionally compute channel target message parameters based on prop-provided URL params and split count. Changed <NewChannel /> prop from convertTargetMessage(props) to convertTargetMessage(initialTargetMessageParams()).

Possibly related PRs

• feat(new-channels): improved scrolling stability #2433: Both PRs modify NewChannelBlockAdapter and channel navigation parameter handling, addressing how location and initial target message params are threaded into channel block components.
• fix(channels): messages sometimes duplicating  #2563: Both PRs affect the channel target-message selection flow—this PR changes how initial ChannelTargetMessageParams are computed and passed to NewChannel, while the related PR refactors the underlying message selection logic and accessors.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description check	✅ Passed	The PR description accurately describes the changeset, explaining the purpose of using search params to navigate in channels when there's a single split.
Title check	✅ Passed	The title follows conventional commits format (feat:) and is under 72 characters (62 chars), accurately summarizing the main change about URL search params for single channel navigation.

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[github-actions]

Preview: https://channels-search-params-j05adm.preview.macro.com/app (4db0505)