fix: prevent crash when selecting artist from Player modal

[skalthoff]

What is the change

Changes the MultipleArtistsSheet modal presentation style from formSheet to containedModal within the Player stack navigator, and adds a clarifying comment for single-artist navigation.

Specific changes:

• src/screens/Player/index.tsx: Replaced formSheet presentation (with sheetAllowedDetents and sheetGrabberVisible) with containedModal
• src/components/Player/components/song-info.tsx: Added documentation comment explaining React Navigation's push behavior

What does this address

Fixes a crash that occurred when tapping an artist name in the Player's song info area when a track has multiple artists. The crash was caused by attempting to present a formSheet modal while already inside the Player modal - iOS doesn't allow stacking sheet-style modals in this way. Using containedModal instead keeps the artist selection sheet within the Player's navigation context, preventing the crash.

Issue number / link

N/A (crash discovered during manual testing)

Tag reviewers

@anultravioletaurora

[skalthoff]

@copilot wtf even is this pr?

[Copilot]

@skalthoff I've opened a new pull request, #902, to work on those changes. Once the pull request is ready, I'll request review from you.

[skalthoff]

fecking useless jfc

[skalthoff]

ok this is actually useful and hsould be merged unless you have any comments @anultravioletaurora