fix(tips): show unread tip count on the scanner Tips tab badge

[bmc08gt]

Problem

Tip chat push notifications don't update the badge on the scanner's Tips tab. In fact the badge never shows a count at all — it's effectively pinned to 0.

Root cause

The unread-count data flows correctly right up to the last hop, then gets dropped:

• RealSessionController observes chatCoordinator.observeUnreadConversations(ChatType.TIP_DM) and keeps SessionState.tipsUnreadCount current.
• A tip push (NavigationTrigger.Chat.ById) calls chatCoordinator.refreshFeed(), which re-syncs the DB; Room re-emits and tipsUnreadCount updates. So the data side already works.
• But ScannerNavigationBar built its NavigationBarState(...) without passing tipsUnreadCount, so NavigationBarState.tipUnreadCount kept its default 0. The Tips nav button reads state.tipUnreadCount → always 0 → the badge never appears or updates.

Fix

Forward the count in ScannerNavigationBar:

state = NavigationBarState(
    contactDmUnreadCount = state.contactDmUnreadCount,
    tipUnreadCount = state.tipsUnreadCount,   // ← added
    ...
)

Note the easy-to-miss naming mismatch: SessionState.tipsUnreadCount (with an s) vs NavigationBarState.tipUnreadCount (no s).

Result

The Tips tab badge now reflects unread tip conversations — updating on a tip push (via the existing feed refresh) as well as on cold start.

Testing

• :apps:flipcash:features:scanner compiles clean.
• Manual: with unread tip DMs, the Tips tab shows the count; receiving a tip push while on the scanner bumps the badge.