Focus search input on navigation reselection

[coyaSONG]

Summary

• focus the search input when the already-selected Search bottom-navigation item is tapped again
• reopen the software keyboard from the active SearchFragment
• leave first-time Search navigation and existing search state unchanged

Validation

• git diff --check
• Gradle configured the prerelease-debug compile task successfully, but the local environment has no Android SDK; the repository pull-request workflow remains the authoritative ABI, build, lint, and test validation

AI assistance: OpenAI Codex. The contribution was checked against the repository's current README and pull-request workflow before implementation.

Closes #3070

[KingLucius]

I think you should use this like instead:
https://github.com/recloudstream/cloudstream/blob/master/app%2Fsrc%2Fmain%2Fjava%2Fcom%2Flagradost%2Fcloudstream3%2FMainActivity.kt#L758

[KingLucius]

Can we use requestFocusFromTouch() ?

[KingLucius]

Please study requestFocusFromTouch() as I know it's focusing the search text and open the keyboard, no need for other code to open the keyboard

[fire-light42]

Please be super careful with focus as we have had issues with this before (#1195). It is recommended to test this on api23 devices to make sure nothing weird happens.