recent_view: Complete TODO to use first unmuted unread message id.

[amanagr]

We already had the data at initial request, so we just add some plumbing to make it available.

Followup to #30008 (comment)

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: web/src/ui_init.js

Function	Unhandled Issue
initialize_everything	Error: Unknown user_id in get_by_user_id: 713675 ... Event Count: 5 Affected Users: 2
initialize_everything	Error: Unknown user_id in get_by_user_id: 715094 ... Event Count: 1 Affected Users: 18
initialize_everything	TypeError: p()("input.stream-list-filter").expectOne is not a function. (In 'p()("input.stream-list-filter")... ... Event Count: 1 Affected Users: 2
initialize_everything	ReferenceError: ResizeObserver is not defined com... Event Count: 1 Affected Users: 1

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[timabbott]

Maybe update_hash_to_match_filter would be a better name? And then maybe we should just pass filter, trigger as the parameters?

[amanagr]

Yeah, updated!

[timabbott]

Merged, after moving one hunk to the last commit.

I don't love the implementation; I worry about those math.min operations being slow, and didn't really want more complexity in the individual unread.ts code paths. But it should work, and we can always refactor later, and I don't want to block getting the basic logic changes to production in a correct way.