fix(ios): clear stale dashboard blur after navigation

[DatScreamer]

Fixes #314

After popping back from a conversation, dashboard session rows can render as opaque gray bars: the row's pinchBlur UIVisualEffectView is stuck at full effect because NavigationStack push/pop finishes the paused UIViewPropertyAnimator that drives it. The stale view persists until an external gesture forces a re-layout.

Changes:

• In forceResetPinchBlurIfIdle, cancel any stale fade CADisplayLink and remove the UIVisualEffectView from the row hierarchy instead of rebuilding the paused animator. The pinch path lazily reinstalls the view and animator when a real pinch begins.

Verification:

• Built with make ios (signed package lane), installed on iPhone 17 Pro simulator.
• Dashboard → open session → back: rows render with titles immediately, no gray bars.

[0xSero]

Landed in #319 (merged as 0824605d). Thanks @DatScreamer. Closing in favour of the convergence PR.