[UI improvement] better player controls on tablet

[ramorimdias]

I am on a Android tablet and the player controls are so small and on the far left of the screen. It would be better to have them bigger and centralized. Also if the video is bright white, is very difficult to see the controls, it would be nice to darken the gradient on the bottom when the buttons are visible. Thanks for the hard work tho!

[ProdigyV21]

Fixed and will ship in v1.9.8.

What was wrong

Three sub-bugs in the bottom controls row of PlayerScreen.kt:

1. Buttons too small on tablet — the sizing logic used if (isTouchDevice) ... else ... which collapsed phone AND tablet into one branch that was actually smaller than the TV branch (24 dp vs 28 dp). Backwards for tablet where viewing distance is short and finger targets should meet Material's 48 dp minimum.
2. "Far left of the screen" — Arrangement.Start left-aligned the row on every device. On a 10"+ tablet this clustered the icons in the bottom-left corner with empty space to the right.
3. "Hard to see on bright content" — the bottom gradient peaked at only 70% alpha at the very bottom and faded to ~20% near the top of the control column. Icons were nearly invisible on bright white backgrounds.

The fix

Landed in #132 (merged to main):

• Three-way device branching (phone / tablet / TV) for button and icon sizes. Tablet now gets the largest sizes (36-48 dp buttons, 22-30 dp icons) to meet the 48 dp touch target. Phone keeps compact sizes for vertical orientation. TV unchanged.
• Tablet is now centered (Arrangement.Center). Phone keeps left-align for vertical space, TV keeps left-align for D-pad traversal.
• Stronger gradient on touch devices: 50% alpha at 20% height, peaking at 85% at the bottom. TV unchanged (content tends not to be as bright there). Icons now stay readable on white backgrounds without being so opaque that they obscure the video.

Testing

Please verify on v1.9.8 on your Android tablet:

1. Play any movie or show.
2. Show the player controls.
3. Confirm buttons are noticeably larger and roughly finger-sized.
4. Confirm the icon row is centered horizontally, not clustered in the bottom-left.
5. Seek to a scene with a bright white background and confirm you can still clearly see the controls.

If any of those still don't look right on 1.9.8, please open a new issue with your tablet model and a screenshot.

Closing as resolved. Thanks for the clear description — three distinct sub-bugs in one report made this easy to pick apart.