refactor(generator): move theme sound data from Go code to embedded JSON files

- Generate sounds.json for each theme inside templates/themes/<name>/
- Load sound data at runtime from embedded FS via templates.ThemeSounds()
- Replace ~1100 lines of hardcoded builder functions and presets with a
  145-line loader (soundCache, initSoundCache, loadThemeSounds)
- Update embed.go to include themes/*/sounds.json in the embedded FS
- Update tests to use loadThemeSounds() instead of themeSoundPresets
- Eliminates duplication between themeSoundPresets and JSON output

Improves cohesion and DRY by keeping theme assets (CSS, JS, meta, sounds)
in a single location per theme directory.

23 files changed, 8444 insertions, 1170 deletions

diff --git a/internal/generator/generator_test.go b/internal/generator/generator_test.go
index 50cd3d0..10116a2 100644
--- a/internal/generator/generator_test.go
+++ b/internal/generator/generator_test.go
@@ -94,15 +94,6 @@ func TestJSONStringOrNull(t *testing.T) {
 	}
 }
 
-func TestThemeSoundPresetsMatchRegistry(t *testing.T) {
-	t.Parallel()
-	for name := range getThemeSet() {
-		if _, ok := themeSoundPresets[name]; !ok {
-			t.Errorf("theme %q has no sound preset in themeSoundPresets", name)
-		}
-	}
-}
-
 func TestThemeSoundsJSONNonEmpty(t *testing.T) {
 	t.Parallel()
 	j := themeSoundsJSON("neon")
@@ -152,9 +143,9 @@ func TestThemeSoundPresetsAmbientPopulated(t *testing.T) {
 	t.Parallel()
 
 	for name := range getThemeSet() {
-		preset, ok := themeSoundPresets[name]
-		if !ok {
-			t.Errorf("theme %q missing from themeSoundPresets", name)
+		preset, err := loadThemeSounds(name)
+		if err != nil {
+			t.Errorf("theme %q loadThemeSounds: %v", name, err)
 			continue
 		}
 
@@ -174,8 +165,8 @@ func TestThemeSoundPresetsAmbientValuesBounded(t *testing.T) {
 	t.Parallel()
 
 	for name := range getThemeSet() {
-		preset, ok := themeSoundPresets[name]
-		if !ok {
+		preset, err := loadThemeSounds(name)
+		if err != nil {
 			continue
 		}
 
diff --git a/internal/generator/templates/embed.go b/internal/generator/templates/embed.go
index ac3efbd..c5a4b22 100644
--- a/internal/generator/templates/embed.go
+++ b/internal/generator/templates/embed.go
@@ -1,6 +1,7 @@
 // Package templates exposes the embedded HTML shell, shared CSS/JS bundles,
 // and per-theme assets used by the generator. Themes live as directories
-// under templates/themes/<name>/ containing theme.css, theme.js, and meta.json.
+// under templates/themes/<name>/ containing theme.css, theme.js, meta.json,
+// and sounds.json.
 // All assets are compiled into the binary via //go:embed so snonux still ships
 // as a single self-contained executable.
 package templates
@@ -13,7 +14,7 @@ import (
 	"sort"
 )
 
-//go:embed shell.tmpl shared/*.tmpl shared/shared.css shared/shared.js themes/*/theme.css themes/*/theme.js themes/*/meta.json
+//go:embed shell.tmpl shared/*.tmpl shared/shared.css shared/shared.js themes/*/theme.css themes/*/theme.js themes/*/meta.json themes/*/sounds.json
 var FS embed.FS
 
 // Shell returns the body of shell.tmpl — the single page template used for
@@ -64,6 +65,11 @@ func ThemeMeta(name string) ([]byte, error) {
 	return FS.ReadFile(path.Join("themes", name, "meta.json"))
 }
 
+// ThemeSounds returns the per-theme sounds.json bytes for the named theme.
+func ThemeSounds(name string) ([]byte, error) {
+	return FS.ReadFile(path.Join("themes", name, "sounds.json"))
+}
+
 // ThemeNames returns a sorted list of available theme names derived from the
 // directories present under templates/themes/.
 func ThemeNames() ([]string, error) {
diff --git a/internal/generator/templates/themes/aurora/sounds.json b/internal/generator/templates/themes/aurora/sounds.json
new file mode 100644
index 0000000..1440fe9
--- /dev/null
+++ b/internal/generator/templates/themes/aurora/sounds.json
@@ -0,0 +1,447 @@
+{
+  "splash": {
+    "freqs": [
+      392,
+      493.88,
+      587.33,
+      783.99
+    ],
+    "spacing": 0.08,
+    "gain": 0.09,
+    "wave": "sine"
+  },
+  "nav": {
+    "freq": 261.63,
+    "wave": "triangle",
+    "dur": 0.085,
+    "gain": 0.1
+  },
+  "open": {
+    "wave": "sine",
+    "start": 390,
+    "end": 780,
+    "dur": 0.16,
+    "gain": 0.1
+  },
+  "close": {
+    "wave": "sine",
+    "start": 523,
+    "end": 196,
+    "dur": 0.18,
+    "gain": 0.09
+  },
+  "bounce": {
+    "wave": "triangle",
+    "start": 180,
+    "end": 90,
+    "dur": 0.12,
+    "gain": 0.09
+  },
+  "ambient": {
+    "normal": {
+      "bpm": 130,
+      "gain": 0.032,
+      "wave": "triangle",
+      "droneFreqs": [
+        98,
+        146.83,
+        196
+      ],
+      "cutoffMin": 1200,
+      "cutoffMax": 5500,
+      "attack": 0.02,
+      "release": 0.1,
+      "melody": [
+        {
+          "freq": 98,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 196,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 98,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 146.8340935339148,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 196,
+          "dur": 1.77408,
+          "step": 0.6283200000000001
+        },
+        {
+          "freq": 246.9445257793951,
+          "dur": 1.1457600000000001,
+          "step": 0.60984
+        },
+        {
+          "freq": 293.6681870678296,
+          "dur": 0.5544,
+          "step": 0.60984
+        },
+        {
+          "freq": 783.99,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 880,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 987.77,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 1174.66,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 987.77,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 880,
+          "dur": 0.42504000000000003,
+          "step": 0.462
+        },
+        {
+          "freq": 783.99,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 82.41,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 164.82,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 82.41,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 123.47548620540732,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 164.81,
+          "dur": 1.77408,
+          "step": 0.6283200000000001
+        },
+        {
+          "freq": 195.99322462359845,
+          "dur": 1.1457600000000001,
+          "step": 0.60984
+        },
+        {
+          "freq": 246.9359893400459,
+          "dur": 0.5544,
+          "step": 0.60984
+        },
+        {
+          "freq": 659.25,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 783.99,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 880,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 987.77,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 880,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 783.99,
+          "dur": 0.42504000000000003,
+          "step": 0.462
+        },
+        {
+          "freq": 659.25,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 65.41,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 130.82,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 65.41,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 98.00426589850373,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 130.81,
+          "dur": 1.77408,
+          "step": 0.6283200000000001
+        },
+        {
+          "freq": 164.81027253674833,
+          "dur": 1.1457600000000001,
+          "step": 0.60984
+        },
+        {
+          "freq": 195.9935487262387,
+          "dur": 0.5544,
+          "step": 0.60984
+        },
+        {
+          "freq": 783.99,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 880,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 987.77,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 1174.66,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 1318.5,
+          "dur": 0.42504000000000003,
+          "step": 0.462
+        },
+        {
+          "freq": 1174.66,
+          "dur": 0.42504000000000003,
+          "step": 0.462
+        },
+        {
+          "freq": 73.42,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 146.84,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 73.42,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 110.00570558428596,
+          "dur": 0.3927,
+          "step": 0.462
+        },
+        {
+          "freq": 146.83,
+          "dur": 1.77408,
+          "step": 0.6283200000000001
+        },
+        {
+          "freq": 184.9942077560642,
+          "dur": 1.1457600000000001,
+          "step": 0.60984
+        },
+        {
+          "freq": 219.99642809780318,
+          "dur": 0.5544,
+          "step": 0.60984
+        },
+        {
+          "freq": 880,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 987.77,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 1174.66,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 1318.5,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 1174.66,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        },
+        {
+          "freq": 987.77,
+          "dur": 0.42504000000000003,
+          "step": 0.462
+        },
+        {
+          "freq": 880,
+          "dur": 0.21252000000000001,
+          "step": 0.231
+        }
+      ],
+      "drums": [
+        "kick",
+        "_",
+        "hat",
+        "kick",
+        "snare",
+        "_",
+        "hat",
+        "_",
+        "kick",
+        "kick",
+        "hat",
+        "_",
+        "snare",
+        "_",
+        "hat",
+        "clap"
+      ]
+    },
+    "wild": {
+      "bpm": 170,
+      "gain": 0.065,
+      "wave": "sawtooth",
+      "droneFreqs": [
+        98,
+        196,
+        293.66,
+        392
+      ],
+      "cutoffMin": 2200,
+      "cutoffMax": 7500,
+      "attack": 0.02,
+      "release": 0.05,
+      "detuneCents": 12,
+      "melody": [
+        {
+          "freq": 196,
+          "dur": 0.30005,
+          "step": 0.353
+        },
+        {
+          "freq": 392,
+          "dur": 0.30005,
+          "step": 0.353
+        },
+        {
+          "freq": 196,
+          "dur": 0.30005,
+          "step": 0.353
+        },
+        {
+          "freq": 293.6681870678296,
+          "dur": 0.30005,
+          "step": 0.353
+        },
+        {
+          "freq": 1567.98,
+          "dur": 0.08119,
+          "step": 0.08825
+        },
+        {
+          "freq": 1760,
+          "dur": 0.08119,
+          "step": 0.08825
+        },
+        {
+          "freq": 1975.53,
+          "dur": 0.08119,
+          "step": 0.08825
+        },
+        {
+          "freq": 2349.32,
+          "dur": 0.08119,
+          "step": 0.08825
+        },
+        {
+          "freq": 1975.53,
+          "dur": 0.08119,
+          "step": 0.08825
+        },
+        {
+          "freq": 1760,
+          "dur": 0.08119,
+          "step": 0.08825
+        },
+        {
+          "freq": 1567.98,
+          "dur": 0.08119,
+          "step": 0.08825
+        },
+        {
+          "freq": 1318.5,
+          "dur": 0.08119,
+          "step": 0.08825
+        }
+      ],
+      "drums": [
+        "kick",
+        "_",
+        "hat",
+        "kick",
+        "snare",
+        "_",
+        "hat",
+        "_",
+        "kick",
+        "kick",
+        "hat",
+        "_",
+        "snare",
+        "_",
+        "hat",
+        "clap"
+      ]
+    }
+  }
+}
diff --git a/internal/generator/templates/themes/biomech/sounds.json b/internal/generator/templates/themes/biomech/sounds.json
new file mode 100644
index 0000000..ecb54ae
--- /dev/null
+++ b/internal/generator/templates/themes/biomech/sounds.json
@@ -0,0 +1,492 @@
+{
+  "splash": {
+    "freqs": [
+      164.81,
+      246.94,
+      311.13,
+      466.16
+    ],
+    "spacing": 0.09,
+    "gain": 0.095,
+    "wave": "triangle"
+  },
+  "nav": {
+    "freq": 233.08,
+    "wave": "sine",
+    "dur": 0.085,
+    "gain": 0.1
+  },
+  "open": {
+    "wave": "triangle",
+    "start": 220,
+    "end": 523.25,
+    "dur": 0.18,
+    "gain": 0.095
+  },
+  "close": {
+    "wave": "sine",
+    "start": 392,
+    "end": 130.81,
+    "dur": 0.2,
+    "gain": 0.09
+  },
+  "bounce": {
+    "wave": "triangle",
+    "start": 160,
+    "end": 80,
+    "dur": 0.14,
+    "gain": 0.09
+  },
+  "ambient": {
+    "normal": {
+      "bpm": 150,
+      "gain": 0.032,
+      "wave": "sawtooth",
+      "droneFreqs": [
+        69.3,
+        110,
+        138.59
+      ],
+      "cutoffMin": 1200,
+      "cutoffMax": 5500,
+      "attack": 0.02,
+      "release": 0.08,
+      "melody": [
+        {
+          "freq": 69.3,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 82.41205306968857,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 98.00499987245549,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 123.47856233425104,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 138.59,
+          "dur": 1.536,
+          "step": 0.544
+        },
+        {
+          "freq": 164.81221406822712,
+          "dur": 0.992,
+          "step": 0.528
+        },
+        {
+          "freq": 207.6503777843393,
+          "dur": 0.48,
+          "step": 0.528
+        },
+        {
+          "freq": 138.59,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 164.81221406822712,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 195.99585760928727,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 246.93930669413928,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 277.18,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 329.62442813645424,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 391.99171521857454,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 493.87861338827855,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 82.41,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 98.00255834737423,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 116.54533967516677,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 146.83792672389072,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 164.81,
+          "dur": 1.536,
+          "step": 0.544
+        },
+        {
+          "freq": 195.99322462359845,
+          "dur": 0.992,
+          "step": 0.528
+        },
+        {
+          "freq": 246.9359893400459,
+          "dur": 0.48,
+          "step": 0.528
+        },
+        {
+          "freq": 164.81,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 195.99322462359845,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 233.07653721470982,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 293.6580354734187,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 329.63,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 391.99834131834695,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 466.16721656504336,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 587.3338889212001,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 58.27,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 69.29509859120856,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 82.40622427948026,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 103.82533661207516,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 116.54,
+          "dur": 1.536,
+          "step": 0.544
+        },
+        {
+          "freq": 146.8311991547485,
+          "dur": 0.992,
+          "step": 0.528
+        },
+        {
+          "freq": 174.61270673920848,
+          "dur": 0.48,
+          "step": 0.528
+        },
+        {
+          "freq": 116.54,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 138.5901971824171,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 164.8124485589605,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 207.65067322415032,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 233.08,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 277.1803943648342,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 329.624897117921,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 415.30134644830065,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 73.42,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 87.31158638349979,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 103.83155974943264,
+          "dur": 0.17,
+          "step": 0.2
+        },
+        {
+          "freq": 130.81956777172744,
+          "dur": 0.17,
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+      "drums": [
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+        "kick",
+        "hat"
+      ]
+    },
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+      "gain": 0.075,
+      "wave": "sawtooth",
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+      "cutoffMin": 2400,
+      "cutoffMax": 7500,
+      "attack": 0.02,
+      "release": 0.04,
+      "detuneCents": 22,
+      "melody": [
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+        },
+        {
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+        }
+      ],
+      "drums": [
+        "kick",
+        "_",
+        "hat",
+        "kick",
+        "_",
+        "snare",
+        "kick",
+        "_",
+        "_",
+        "kick",
+        "hat",
+        "_",
+        "snare",
+        "_",
+        "kick",
+        "hat"
+      ]
+    }
+  }
+}
diff --git a/internal/generator/templates/themes/brutalist/sounds.json b/internal/generator/templates/themes/brutalist/sounds.json
new file mode 100644
index 0000000..ffafee1
--- /dev/null
+++ b/internal/generator/templates/themes/brutalist/sounds.json
@@ -0,0 +1,342 @@
+{
+  "splash": {
+    "freqs": [
+      261.63,
+      329.63,
+      392,
+      523.25
+    ],
+    "spacing": 0.09,
+    "gain": 0.1,
+    "wave": "square"
+  },
+  "nav": {
+    "freq": 440,
+    "wave": "square",
+    "dur": 0.06,
+    "gain": 0.11
+  },
+  "open": {
+    "wave": "square",
+    "start": 440,
+    "end": 880,
+    "dur": 0.15,
+    "gain": 0.1
+  },
+  "close": {
+    "wave": "square",
+    "start": 660,
+    "end": 220,
+    "dur": 0.15,
+    "gain": 0.09
+  },
+  "bounce": {
+    "wave": "square",
+    "start": 200,
+    "end": 100,
+    "dur": 0.1,
+    "gain": 0.1
+  },
+  "ambient": {
+    "normal": {
+      "bpm": 140,
+      "gain": 0.032,
+      "wave": "sawtooth",
+      "droneFreqs": [
+        65.41,
+        98,
+        130.81
+      ],
+      "cutoffMin": 1200,
+      "cutoffMax": 5500,
+      "attack": 0.02,
+      "release": 0.1,
+      "melody": [
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+          "dur": 0.096525,
+          "step": 0.2145
+        },
+        {
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+          "dur": 0.096525,
+          "step": 0.2145
+        },