Fix tablet subtitle alignement + QuickShelf refinement

[jingle-jew]

Summary

This PR refines the now-playing subtitle behavior across tablet, mobile, and RTL layouts.

Changes

Now-Playing/Subtitle

• Aligns the now-playing subtitle with the title in tablet view, including the empty-media state.
• Adjusts the subtitle scrolling animation so it only runs when the subtitle actually overflows.
• Keeps the scrolling animation active in tablet performance mode where it was previously disabled.
• Resyncs subtitle overflow measurements after tablet soft-resize updates.
• Fixes subtitle truncation behavior for Hebrew/RTL by avoiding the LTR scrolling treatment there.
• Keeps UI alignment and spacing consistent across LTR/RTL layouts.

QuickShelf

• Adds a soft edge fade to #emptyQuickShelf so the horizontal scroll area feels less abruptly clipped.
• Keeps the first visible item clear of the fade at the initial scroll position in both LTR and RTL layouts.
• Softens the fade gradient with a wider transition and intermediate opacity stops.
• Preserves compact layout spacing while keeping the edge fade consistent.

Testing

• npm run build successful
• Verified generated dist/homeii-music-flow.js is updated.

Before

After

Before

After

Mobile view showing QuickShelf fade-out

[jingle-jew]

I’d also suggest enlarging the QuickShelf panel on tablet layouts so it can display at least two full playlist tiles when scrolling. This would help the UI feel more balanced and consistent while still keeping a clean and cohesive look.

[r11a]

Looks good overall. I’d just like two small adjustments before merging:

1. Please scope the performance-lite subtitle animation override to tablet only, so mobile/weak devices keep the lighter performance behavior.

2. Since the QuickShelf fade adds side padding, please make sure the tablet shelf still shows at least two full tiles, or keep that as a separate follow-up.

After that I’m good with merging.

[jingle-jew]

@r11a

As requested, the following have been made:

• Configured the Now Playing subtitle scrolling animation to be disabled in Ultra Lite mode
• Adjusted the QuickShelf carousel’s initial state to ensure at least 2 tiles are visible