feat(TopBar): add a search messages button

[Jafetlch]

☑️ Resolves

The in-conversation message search is hard to find: the only way to reach it is through the right sidebar. This adds a search button to the conversation top bar that opens it directly.

While wiring the button I noticed showSidebar({ activeTab: 'search' }) landed on the participants tab, since 'search' is a content state and not a tab id. RightSidebar.handleUpdateActive now forwards 'search' to handleUpdateState('search').

The first version of this PR also bound Ctrl+F, removed after @Antreesy pointed out it is already taken by the conversation search in the left navigation.

AI (if applicable)

• The content of this PR was partly or fully generated using AI

Developed with Claude Code (claude-opus-4-8), commit carries the Assisted-by trailer. Reviewed and verified on a local Nextcloud 34 + Talk stable34 instance.

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

🏚️ Before	🏡 After
No search entry point in the chat view

🏁 Checklist

• 🌏 Tested with different browsers / clients:
  • Chromium (Chrome / Edge / Opera / Brave)
  • Firefox
  • Safari
  • Talk Desktop
• 🏗️ Changes to database schema — no
• 🔖 New/changed API endpoints — no

[nickvergessen]

Without looking at the code at all:

(search button visible in TopBar next to call button, sidebar opens to Search tab on click or Ctrl+F)

Please add screenshots to assist the review process

Also your commit is missing the DCO to confirm you did the changes and the license is okay:
https://github.com/nextcloud/server?tab=contributing-ov-file#sign-your-work

[Antreesy]

Besides, Ctrl+F is already taken by conversations search in left navigation: 6fce2eb
It's more a matter of giving it priority higher than the global Unified search

[Jafetlch]

Thanks for the feedback! I've updated the PR:

• Removed the Ctrl+F shortcut — as @Antreesy pointed out it's already bound to the conversation search in the left navigation. The PR is now just the discoverable TopBar button.
• Signed off the commit (DCO now passes).
• Added screenshots to the description (@nickvergessen).

One thing worth a look during review: the button needed a small change in RightSidebar as well — handleUpdateActive now routes the 'search' value to handleUpdateState('search'). Without it, showSidebar({ activeTab: 'search' }) fell back to the participants tab instead of opening the message search. Verified end-to-end on a local Nextcloud 34 + Talk stable34 build.

Happy to adjust the button placement or the approach if you'd prefer a different one.

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