v3.36.0: a deliberate "insert the next card" cue for batch runs

The waiting phase is the only moment the operator must act, so it now:
- shows a card-into-reader SVG animation in the status modal (inline
  SVG, CSS keyframes in src/style.css; reduced-motion users get the
  static card-above-the-slot picture);
- plays a short Web Audio chime once per card, edge-triggered in the
  2 s poll so it never repeats (the AudioContext is unlocked by the
  Start click);
- sets the tab title to "Insert next card" while the window is hidden;
- offers a speaker toggle next to the status (persisted as
  simple_ram_batch_sound, on by default).

The prebuilt style.css was rebuilt: it had gone stale and lacked
utilities the UI already used (bg-blue-50 on the batch notice,
inline-flex, mx-2, max-h-48, w-44, min-w-24).

1022 Python + 1062 frontend green; simple-v470.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pysim-simple-server"
-version = "3.35.0"
+version = "3.36.0"
 description = "HTTP REST server wrapping pysim for the SIMple PWA"
 license = { text = "GPL-2.0-or-later" }
 requires-python = ">=3.9"