fix(navigation): make push-enter feel as grounded as pop-exit

[lostf1sh]

Summary

• Mirror the decelerate emphasized easing to (0.2, 0.85, 0.7, 1) so its time profile matches popExit's accelerate curve in reverse — the old (0.05, 0.7, 0.1, 1) front-loaded ~70% of the slide into the first 22ms, making new screens feel snap-in
• Add scaleIn(0.92f) to enterTransition() to match the visual weight of popExit's scaleOut(0.92f)
• Run fadeIn over the full TRANSITION_DURATION with an accelerate curve so alpha lags the slide — fixes the perceptual mismatch where the fade appeared to arrive before the slide (alpha changes are more visible than position changes at the same progress percentage)

Why

Reported by user testing settings navigation: the entrance animation felt instant compared to the exit. Investigation showed the asymmetry was real — decelerate emphasized's steep initial slope (0.85/0.2 ≈ 4.25x average speed at t=0) was completing the bulk of motion in ~22ms, while popExit's accelerate curve produced a gentle build with a satisfying late settle. Three changes restore symmetry: matched easing time-profile, matched scale weight, and offset fade timing.

Test plan

• Open Settings, tap any section (Library, Appearance, Playback, etc.) — entrance should feel weighty/grounded, not snap-in
• Press back from the section — exit should feel unchanged (this was already at the right level)
• Same check across other forward/back navigations (Album→AlbumDetail, Artist→ArtistDetail, etc.) since enterTransition() is global
• Verify nothing regressed in the parallax exit (exitTransition), pop-enter, or pop-exit transitions

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