fix(conversation): restore in-chat search button and repair locale drift

[RonenMars]

Summary

integration-merge-354-355-376 has never been run through test.yml, so three CI failures accumulated unnoticed across ~82 commits.
PR #425 was the first thing to trigger CI on that branch, which is how they surfaced.
None of them were caused by #425; this PR fixes them so that branch can go green.

Type check + Integration tests

Both traced to a single lost code block in app/conversation/[id].tsx.

a1e263c1 added LivePauseControl to the header actions and, in resolving that conflict, deleted the in-chat search Pressable that ff28c605 had introduced.
Everything around it survived: the MagnifyingGlass import, the headerButton / headerButtonActive styles, the searchBarState hook, the search.open locale key, and the full test coverage.
The same commit dropped the makeSearchStyles import while leaving its call site at line 67, which is the TS2552: Cannot find name 'makeSearchStyles' error.

Restored both, verbatim from a1e263c1^.
This is a real user-facing regression, not just a test fix — in-chat search has had no entry point on the conversation detail screen since that commit.

i18n unused keys

Three keys had no remaining code reference.

b75dfb87 pruned connect.step1 and connect.step2 as dead, but ConnectStep.tsx:196-198 still renders all three steps as a numbered sequence, so users saw a gap and then "3. …" alone.
Restored step1 and step2 in all four locales using their pre-prune text from history, so no translations were invented.

Dropped onboarding.connect.footnote and servers.dialog.removeDismiss, which are genuinely unreferenced.

conversation.search.open is deliberately left untouched: it is the restored button's accessibilityLabel, so it was never dead.

Test plan

• Type check: clean (was 3 errors)
• Integration tests: 39/39 suites, 239/239 tests pass (was 4 suites / 34 tests failing)
• i18n: 3/3 suites, 55 passed (was 1 suite / 3 tests failing)
• Unit tests: 95/95 suites, 897 tests pass
• ESLint clean on the modified file
• Manually confirm the search icon appears in the conversation header and toggles the search bar

Notes

Worth considering why this went unseen: test.yml triggers on pull_request and on pushes to main / chore/bump-**, so a long-lived integration branch accumulating direct commits never gets a CI run.
Adding it to the push branch list would catch this class of drift at the commit that causes it rather than 82 commits later.