Add hover states to the footer refresh button and settings gear

[mstallone]

TL;DR — The popover footer's refresh countdown and settings gear now give visible hover feedback.

What was happening

• The footer's refresh/countdown button and gear menu had no hover state: the refresh text stayed secondary gray under the pointer, and on macOS 15 the gear's frosted circle gave no hover response at all (the Liquid Glass shimmer on macOS 26 is subtle).

What this changes

• Hovering the refresh button brightens its glyph and countdown from secondary to primary (suppressed while a refresh is in flight, when the button is disabled).
• Hovering the gear adds a subtle primary-tinted fill inside its glass circle, over the glass and under the glyph.
• Both use a quick 0.12s ease-out and reset their hover state when the popover closes (orderOut delivers no hover exit) and when the control unmounts on a screen switch, so a control can't remount pre-highlighted.

Tests

• Built and ran the dev app; captured the footer at rest, with refresh hovered, and with gear hovered to verify all three states render as intended.

https://claude.ai/code/session_01Lfvn6KcURg32FgptPoHcWd