Play a sound through a graph of gain, pitch and EQ effects #311

A sound could only be played as it was uploaded. A Sound FX asset is
a node graph like a shader: Input, effects, Output. Play sound has a
new input fx that sends the voice through it.

- New asset type soundfx ("Sound FX"), not placeable, with a graph
  and its own tab. The heading in the asset panel is "Sound effects",
  so it does not take the click meant for the + menu entry.
- Nodes in core/soundfx/nodes.ts, category sound, port type audio
  that only fits audio: Input, Output, Gain (dB), Pitch (semitones),
  EQ (80 Hz and 12 kHz shelves, peaks at 250 Hz, 1 kHz and 4 kHz).
- compileSoundFx walks back from the Output with the shared graph
  emitter. An input takes one edge, so the result is one line: a
  pitch and a list of gain and filter stages. A node without input
  or a graph without Output reports a problem on the node.
- Pitch is the playback rate of the source. It applies to the whole
  sound and also changes its length, the node description says so.
- The BehaviorSystem resolves fx and hands the line to the AudioSink.
  An fx that is missing or does not compile plays the sound dry.
- SoundLibrary wires source, stages, volume, destination in that
  order. stats().last now also names pitch and stage count.
- The tab header picks one of the project's sounds and plays it
  through the graph as it stands. Stop there ends only its own voice.

Tests:
- soundfx.test.ts (new, 11), sound-library (9, +2 for the wiring),
  node-catalog (+1 for fx), graph and asset-groups adjusted
- e2e 34: ALL PASSED - 26 checks (+5: + menu opens the tab, palette,
  2 effects, tab Play and game Play through the FX at -12 st)
- Gate on melektaus-atx: typecheck, lint, prettier clean, 239 of 240
  test files green. The red one was sound-library (its fake
  AudioContext had no playbackRate), fixed afterwards, gate not
  re-run in full.
- Counter-check: without the audio rule in portsCompatible the port
  test fails.

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

src/core/graph/NodeRegistry.ts

@@ -30,11 +30,12 @@ export interface PortDef {
 }
 
 /**
- * `state`, `shader` and `particles` are the categories no behavior graph offers: their nodes are the
- * states of a state machine, the GLSL of a shader asset and the motion of one particle.
+ * `state`, `shader`, `particles` and `sound` are the categories no behavior graph offers: their nodes
+ * are the states of a state machine, the GLSL of a shader asset, the motion of one particle and the
+ * effects of a sound FX asset.
  */
 export type NodeCategory =
-  'event' | 'flow' | 'data' | 'variable' | 'action' | 'state' | 'shader' | 'particles';
+  'event' | 'flow' | 'data' | 'variable' | 'action' | 'state' | 'shader' | 'particles' | 'sound';
 
 /**
  * How a loop node asks for one of its exec outputs to be run repeatedly: `port` carries the body,
@@ -207,7 +208,13 @@ export function inlineInputs(def: NodeDef): PortDef[] {
 function isInlinePort(port: PortDef): boolean {
   if (port.inline === false) return false;
   if (port.type === 'vec3') return port.field !== undefined;
-  return port.type !== 'exec' && port.type !== 'object' && port.type !== 'struct' && port.type !== 'picture';
+  return (
+    port.type !== 'exec' &&
+    port.type !== 'object' &&
+    port.type !== 'struct' &&
+    port.type !== 'picture' &&
+    port.type !== 'audio'
+  );
 }
 
 /** Untyped, an input writes the zero of its kind; as its default the node body shows it, not just the name. */