Conditional coachmarks with feature flag support

[aldefy]

Summary

Built-in support for conditionally showing coachmarks based on user segment, feature flags, or custom predicates.

Proposed API

coachmarkController.showIf(
    condition = { userSegment == "new" && !hasSeenOnboarding },
    target = onboardingTarget,
)

Details

• showIf wraps show() with a predicate check
• Works with sequences too: showSequenceIf(condition, targets)
• Integrates with CoachmarkRepository for "already seen" checks
• Composable version: LaunchedShowIf that re-evaluates on recomposition

Part of the v1.3 roadmap.