fix(input_setup): keep backdrop-blur during calibration wizard

[OmikronApex]

Summary

• Hiding the entire #input-setup-overlay removed it from the render tree, stripping its backdrop-blur-sm — so the background blur vanished while the calibration wizard was open and returned when it closed.
• Fix: hide only the [data-is-host] card inside the overlay; the overlay element itself stays in the DOM so its backdrop-blur remains active throughout.

Test plan

• Open initial setup wizard
• Verify background blur is visible before starting calibration
• Click the calibration button — confirm blur persists while calibration wizard is open
• Complete or cancel calibration — confirm input-setup card is restored normally

🤖 Generated with Claude Code

[byrongamatos]

Thanks for chasing the lost blur — that's a real glitch. But I think this approach regresses the tuner exposure that the original full-overlay-hide was protecting (the failure mode the screen.js:167 comment calls out, and what core #577 fixed).

The problem

The change keeps #input-setup-overlay mounted (fixed inset-0 z-[210] bg-black/60 backdrop-blur-sm, pointer-events:auto) and hides only the inner card. But that overlay is full-screen, and the layering is:

Layer	z-index
note_detect calibration wizard	300
#input-setup-overlay (kept by this PR)	210
player / highway / transport / tuner	1–10

When the user hits "Minimize Wizard — Play Song", the wizard (z-300) sets itself background:transparent; pointer-events:none to expose the player/tuner underneath. With the overlay still mounted, the z-210 layer now sits between the transparent wizard and the player — so during the minimized state the tuner/player is:

• dimmed (bg-black/60),
• blurred (backdrop-blur-sm),
• and click-blocked — clicks fall through the now-pointer-events:none wizard and are swallowed by the z-210 overlay before they reach the player controls (z 1–10).

So "Minimize Wizard — Play Song" (and any tuner interaction during minimize) breaks. The original code hid the whole overlay precisely to avoid this. None of the test-plan steps here exercise the minimized state, which is where it shows up.

Suggested fix

Move the backdrop-blur-sm onto the calibration wizard overlay itself (note_detect side, z-300) instead of relying on input_setup's overlay. Then:

• wizard shown → blur present (on the wizard, above everything);
• wizard minimized → it goes transparent, so the blur correctly vanishes and the player/tuner is sharp + interactive;
• input_setup keeps fully hiding its overlay → no occlusion.

That gets the blur you want without re-occluding the tuner — but it's a change in note_detect, not here. Alternatively, if you want to keep it in input_setup, the overlay would at minimum need pointer-events:none and to drop its dim/blur whenever the wizard is in its minimized state — which is more coupling than it's worth.

Happy to take the wizard-side approach if you'd prefer.