Refine appearance settings and syntax highlighting

Keep parsed chat and tool detail content in sync with appearance token changes. Hide font-family controls on native, use One as the default syntax theme, add Swift highlighting, and give Nord a distinct light palette.

package-lock.json

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+      "resolved": "https://registry.npmjs.org/@codemirror/view/-/view-6.43.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "crelt": "^1.0.6",
+        "style-mod": "^4.1.0",
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@@ -7874,6 +7918,12 @@
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+      "license": "MIT"
+    },
     "node_modules/@napi-rs/wasm-runtime": {
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       "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.1.1.tgz",
@@ -16979,6 +17029,12 @@
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       "license": "MIT"
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+      "resolved": "https://registry.npmjs.org/crelt/-/crelt-1.0.6.tgz",
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       "license": "MIT"
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+    "node_modules/style-mod": {
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+      "resolved": "https://registry.npmjs.org/style-mod/-/style-mod-4.1.3.tgz",
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+      "license": "MIT"
+    },
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       "resolved": "https://registry.npmjs.org/style-to-js/-/style-to-js-1.1.21.tgz",
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+    "node_modules/w3c-keyname": {
+      "version": "2.2.8",
+      "resolved": "https://registry.npmjs.org/w3c-keyname/-/w3c-keyname-2.2.8.tgz",
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+      "license": "MIT"
+    },
     "node_modules/w3c-xmlserializer": {
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       "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-4.0.0.tgz",
@@ -37674,6 +37742,8 @@
       "name": "@getpaseo/highlight",
       "version": "0.1.87",
       "dependencies": {
+        "@codemirror/language": "^6.12.3",
+        "@codemirror/legacy-modes": "^6.5.3",
         "@lezer/common": "^1.5.0",
         "@lezer/cpp": "^1.1.5",
         "@lezer/css": "^1.3.0",