Show a Limiter node as a device that holds what it took away (#397)

A Limiter only said what it does in rows of numbers. How much it took
away, and when, could not be seen at all, and a short sound is over
before any needle could show it. Now the node is a device of its own
size, and its screen catches the reduction from the moment a sound
starts and holds it once the sound ends.

- LimiterPanel draws a 720x280 plate of brushed brick. The threshold
  knob is large, ceiling and release are small beside it, auto-gain is
  a lever. A LIMIT lamp lights while it takes something away.
- The screen hangs the reduction down from the top, 0 to 24 dB by the
  square root like the Compressor's meter. The level coming in runs
  along the bottom, orange above the limit. Time runs from the start
  of the sound over 1, 2, 4 or 8 s, and a longer sound rolls.
- ReductionCapture in limiterView holds the capture after 0.4 s of
  silence, without the silence, until the next sound. It writes the
  most taken away and when, and NOW or LASTED on the right.
- The Limiter is tapped now, like the Compressor. The face reads the
  loudest sample since the last frame on both sides.
- SpectrumTaps.levels takes a lateBy. The side in front is read 5 ms
  earlier, so a peak going in is met by what it became.
- limiterReduction leaves the auto-gain out and solves Wet's blend for
  the limited part. Less than 0.2 dB counts as none.
- A capture is also held when the node leaves the picture. Changing a
  knob or the lever leaves it as it is.
- Hook __gm.limiter.panel(id) for the sound FX and instrument graphs.

Decided myself:

- The capture stays held until the next sound, not for a fixed time.
- The screen has no wet knob, as the Compressor's has none.
- The Limiter's two taps cost two gains of 1 per voice. The analysers
  only exist while the node is in the picture.

Measured on stein2: the seeded blip at -4.4 dBFS against -12 dB showed
7.56 dB. Three hits at 0, -8 and -2 dBFS showed 11.9 dB at the first.
In e2e 34 on melektaus-atx, -10.44 dBFS in against -20 dB showed
9.56 dB, the difference to the hundredth.

Tests:
- Unit: limiter-view 13 tests (new), spectrum 6 (1 new), soundfx 67
  with the Limiter's taps.
- Counter-test: without Wet's share in the formula the blend test
  fails.
- e2e 34: ALL PASSED, 138 checks (1 new).
- Gate: CHECK EXIT 0, 290 files, 4445 tests.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/core/soundfx.test.ts

@@ -459,13 +459,13 @@ describe('a Compressor and a Limiter in a sound FX graph (#326)', () => {
       (s) => s.kind !== 'tap',
     );
 
-  it('tap a Compressor on both sides for its tab, a Limiter not (#378)', () => {
+  it('tap a Compressor on both sides for its tab (#378), a Limiter for its screen (#397)', () => {
     const kinds = (type: string) =>
       fxChainOf(compileSoundFx(line([{ type }]).fx.graph).compiled!).stages.map((s) =>
         s.kind === 'tap' ? `tap ${s.at}` : s.kind,
       );
     expect(kinds('SoundFxCompressor')).toEqual(['tap in', 'compress', 'tap out']);
-    expect(kinds('SoundFxLimiter')).toEqual(['limit']);
+    expect(kinds('SoundFxLimiter')).toEqual(['tap in', 'limit', 'tap out']);
   });
 
   it('compress at their defaults, the gain after it worked out from makeup and auto-gain', () => {
@@ -729,7 +729,9 @@ describe('Bypass and Wet (#354)', () => {
   });
 
   it('a blend is as late as what it blends and rings as long', () => {
-    const [limit] = fxChainOf({ pitch: [], stages: stagesOf('SoundFxLimiter', { wet: 0.5 }) }).stages;
+    const [limit] = fxChainOf({ pitch: [], stages: stagesOf('SoundFxLimiter', { wet: 0.5 }) }).stages.filter(
+      (s) => s.kind !== 'tap',
+    );
     expect(limit).toMatchObject({ kind: 'wet' });
     expect(stageLatency(limit!, 48000)).toBe(0.005);
     expect(fxRings({ pitch: [], stages: stagesOf('SoundFxLimiter', { wet: 0.5 }) })).toBe(true);