Add option to hide the voice search button

[JustinZeus]

Description

Adds a "Show voice search button" toggle to the search page's view options dialog, alongside the existing "Combined search results" toggle. When disabled, the voice search button is hidden from the search row, taking it out of the D-pad focus path.

The new field show_voice_search_button is added to SearchPreferences (default true). The serializer applies the default for new installs, and a new entry in AppUpgradeHandler sets it to true for users upgrading from earlier versions so existing behaviour is preserved.

Related issues

Discussion: #1419

Testing

Tested on an Android TV (1080p) AVD running API 34:

• Toggle on (default): voice search button visible at the top of the search row.
• Toggle off: button disappears; only the search text field remains.
• Toggle back on: button reappears.
• Upgrade handler verified by spoofing version.current.name to an older value in SharedPreferences and force-restarting the app; after needUpgrade() fired, the toggle was on as expected.

The upgrade-handler entry currently uses 0.6.4-8-g0 (based on current main HEAD); happy to bump this if you'd prefer a different target version on merge.

Screenshots

AI or LLM usage

I used Claude to scaffold the proto/serializer/upgrade-handler/dialog changes, mirroring the existing combined_search_results pattern. I reviewed each diff before committing and tested the toggle manually on the emulator, including the upgrade-handler simulation.

[damontecres]

Thanks for the contribution! Left a couple minor comments

[JustinZeus]

Thanks for the suggestions. Is this what you had in mind? @damontecres

[damontecres]

LGTM, I pushed a tweak to the animation.

There's also a focus problem, but it'll require some rewriting, so I'll do it in a follow up PR Edit: actually it was a lot easier than I expected, so I pushed the fix

[JustinZeus]

Thanks! I'm new to Kotlin and Android development. This project has amazed me in it's quality and prompted me to switch from Plex to Jellyfin. I'm a tech lead by day (web dev, CI/CD), so I felt obligated to do my part and try to help out. Thanks for the patience and acceptance.

[damontecres]

I'm glad you like it! And super happy you're making it even better!

Since you're new to kotlin & android, let me elaborate on the changes I made.

First, I just think the fade and shrinking towards End looks better.

Second, moving the padding to the individual row elements instead using the Row's spacedBy means when the voice button disappears, the Row doesn't abruptly have to drop the spacing between the elements. Instead the padding shrinks/expands with the button!

Finally, the focus issue happened when opening the search page if you have the voice button hidden, focus might jump to the nav drawer. This is because initially the button is always shown (the initial value was true) and then it's updated, so it focused on the button which then disappears so the focus is lost. Instead, it can use the initial value from the userPreferences (which will be up to date) passed in and collect any further changes to that.

Hopefully all that makes sense

[JustinZeus]

Thanks for the explanations! Funny how quickly you managed to find and fix a bug like that.