Add a Custom swatch to the appearance settings accent color grid,
backed by a hex value stored in settings (synced via iCloud like the
rest). iOS uses the native ColorPicker wheel; macOS uses a circular
swatch that opens NSColorPanel, since the SwiftUI color well looks out
of place among the circles. All accent consumers now read the resolved
color through SettingsManager.resolvedAccentColor.
The indigo preset is retired from the grid but kept in the enum, so
users who selected it keep their color until they pick another one.
Claude-Session: https://claude.ai/code/session_0154KH8RAVAvm6iVanhmoW8o
Color.accentColor and .foregroundStyle(.tint) resolve to the asset
catalog accent on macOS, so Home shortcut cards, section header
links, the Subscriptions "All channels" header, and the Downloads
per-channel group headers stayed blue when the user picked a
different accent. Read the color from SettingsManager and apply it
directly, matching the pattern already used for the Play button.
