fix(reader): both toolbars showed below 768px — cascade-layer conflict

The display:none for the full toolbar lived in @layer components while
the div also carried Tailwind's flex utility (@layer utilities). Layer
order beats specificity, so the utilities layer always won and the
full bar never hid below the breakpoint (the compact row only worked
because it had no display utility of its own).

Switch to Tailwind's own responsive utilities in the markup — full
toolbar 'hidden md:flex', compact row 'flex md:hidden' — and delete
the custom rules; responsive display now resolves inside a single
layer where source order (responsive variants after base) guarantees
the right winner.

web/static/style.css

@@ -1,2 +1,2 @@
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