Use tertiaryContainer color role for antiandrogen medication event items

[Copilot]

Antiandrogen medication event items were using secondaryFixedDim as their container color, with no explicit on-colors for text/icons. This switches them to the tertiaryContainer role with a full set of M3-compliant on-colors providing proper contrast in both light and dark themes.

Color scheme changes (antiandrogen items only)

Element	Before	After
Container	secondaryFixedDim	tertiaryContainer
Leading icon	tertiary	onTertiaryContainer
Headline	(M3 default)	onTertiaryContainer
Overline (route label)	(M3 default)	onTertiaryFixedVariant
Trailing time	(M3 default)	onTertiaryFixed
Trailing date	(M3 default)	onTertiaryFixedVariant

Non-antiandrogen items are unchanged.

Implementation

Two separate ListItemDefaults.colors() calls replace the previous single call, avoiding passing Color.Unspecified into M3 token slots:

val listItemColors = if (isAntiAndrogen) {
    ListItemDefaults.colors(
        containerColor = MaterialTheme.colorScheme.tertiaryContainer,
        leadingIconColor = MaterialTheme.colorScheme.onTertiaryContainer,
        headlineColor = MaterialTheme.colorScheme.onTertiaryContainer,
        overlineColor = MaterialTheme.colorScheme.onTertiaryFixedVariant,
    )
} else {
    ListItemDefaults.colors(
        containerColor = MaterialTheme.colorScheme.secondaryContainer,
        leadingIconColor = MaterialTheme.colorScheme.tertiary,
    )
}

Trailing text colors are handled separately via Text(color = ...) since they live outside ListItem's slot color system, using onTertiaryFixed (time) and onTertiaryFixedVariant (date) for antiandrogen items, Color.Unspecified otherwise.

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