feat(tips): auto-enable tipping when resolving a scanned or deeplinked tip card

[bmc08gt]

What

When a user encounters someone else's tip card — either by scanning it or opening a tip deeplink — we now auto-enable the Tipping beta flag for them so they can reciprocate without first digging the flag out of beta settings.

Both entry points funnel through a single method, so the flag flip lives in one place:

• Scan → CodeScanDelegate.Event.TipCardScanned → resolveTipCard(userId)
• Deeplink → DeeplinkAction.PresentTipCard → resolveTipCard(userId)

How

• Injected FeatureFlagController into TippingCoordinator and call set(FeatureFlag.Tipping, true) in resolveTipCard(userId)'s onSuccess block (only after the counterparty's profile resolves successfully; before the tip card itself is assembled).
• FeatureFlag.Tipping is what drives isTippingEnabled in RealSessionController, so this opts the viewer into the full tipping experience.
• Added the :apps:flipcash:shared:featureflags module dependency to shared:tipping.

The flip is a no-op when the flag is already on, and does not fire when profile resolution fails.

Tests

Added coverage to TippingCoordinatorTest:

• flag enabled on successful resolve
• flag untouched when resolution fails

Also wired the vibrator constructor arg the existing test was missing after the earlier vibrate change. All 6 tests in the module pass.