feat(git-diff): add Lezer-based syntax highlighting

- Add @lezer/highlight and language parsers (JS/TS, JSON, CSS, HTML, Python, Markdown)
- Create syntax-highlighter utility that parses code with Lezer and returns highlight tokens
- Integrate highlighting into diff view with color-coded tokens
- Keywords (purple), strings (green), numbers (orange), functions (blue), types (yellow), etc.
- Highlighting respects add/remove line backgrounds

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package-lock.json

@@ -5139,6 +5139,95 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@lezer/common": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/@lezer/common/-/common-1.5.0.tgz",
+      "integrity": "sha512-PNGcolp9hr4PJdXR4ix7XtixDrClScvtSCYW3rQG106oVMOOI+jFb+0+J3mbeL/53g1Zd6s0kJzaw6Ri68GmAA==",
+      "license": "MIT"
+    },
+    "node_modules/@lezer/css": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/@lezer/css/-/css-1.3.0.tgz",
+      "integrity": "sha512-pBL7hup88KbI7hXnZV3PQsn43DHy6TWyzuyk2AO9UyoXcDltvIdqWKE1dLL/45JVZ+YZkHe1WVHqO6wugZZWcw==",
+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.2.0",
+        "@lezer/highlight": "^1.0.0",
+        "@lezer/lr": "^1.3.0"
+      }
+    },
+    "node_modules/@lezer/highlight": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/@lezer/highlight/-/highlight-1.2.3.tgz",
+      "integrity": "sha512-qXdH7UqTvGfdVBINrgKhDsVTJTxactNNxLk7+UMwZhU13lMHaOBlJe9Vqp907ya56Y3+ed2tlqzys7jDkTmW0g==",
+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.3.0"
+      }
+    },
+    "node_modules/@lezer/html": {
+      "version": "1.3.13",
+      "resolved": "https://registry.npmjs.org/@lezer/html/-/html-1.3.13.tgz",
+      "integrity": "sha512-oI7n6NJml729m7pjm9lvLvmXbdoMoi2f+1pwSDJkl9d68zGr7a9Btz8NdHTGQZtW2DA25ybeuv/SyDb9D5tseg==",
+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.2.0",
+        "@lezer/highlight": "^1.0.0",
+        "@lezer/lr": "^1.0.0"
+      }
+    },
+    "node_modules/@lezer/javascript": {
+      "version": "1.5.4",
+      "resolved": "https://registry.npmjs.org/@lezer/javascript/-/javascript-1.5.4.tgz",
+      "integrity": "sha512-vvYx3MhWqeZtGPwDStM2dwgljd5smolYD2lR2UyFcHfxbBQebqx8yjmFmxtJ/E6nN6u1D9srOiVWm3Rb4tmcUA==",
+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.2.0",
+        "@lezer/highlight": "^1.1.3",
+        "@lezer/lr": "^1.3.0"
+      }
+    },
+    "node_modules/@lezer/json": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@lezer/json/-/json-1.0.3.tgz",
+      "integrity": "sha512-BP9KzdF9Y35PDpv04r0VeSTKDeox5vVr3efE7eBbx3r4s3oNLfunchejZhjArmeieBH+nVOpgIiBJpEAv8ilqQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.2.0",
+        "@lezer/highlight": "^1.0.0",
+        "@lezer/lr": "^1.0.0"
+      }
+    },
+    "node_modules/@lezer/lr": {
+      "version": "1.4.6",
+      "resolved": "https://registry.npmjs.org/@lezer/lr/-/lr-1.4.6.tgz",
+      "integrity": "sha512-u42yGuGBsHgodm86lwi0HAtUTNSs23yl9RoaI5em90B+OGm9/XuWkNiJ46sKkCgp8Tp4zgoBQbepcshfKLhFdw==",
+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.0.0"
+      }
+    },
+    "node_modules/@lezer/markdown": {
+      "version": "1.6.2",
+      "resolved": "https://registry.npmjs.org/@lezer/markdown/-/markdown-1.6.2.tgz",
+      "integrity": "sha512-iNSdKrIK0FfOjVPVpV0fu7OykdncYpEzf4vkG9szFf60ql/ObZShoVbM9u1tgkogDOmubms1CyoNS2/unOXWNw==",
+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.5.0",
+        "@lezer/highlight": "^1.0.0"
+      }
+    },
+    "node_modules/@lezer/python": {
+      "version": "1.1.18",
+      "resolved": "https://registry.npmjs.org/@lezer/python/-/python-1.1.18.tgz",
+      "integrity": "sha512-31FiUrU7z9+d/ElGQLJFXl+dKOdx0jALlP3KEOsGTex8mvj+SoE1FgItcHWK/axkxCHGUSpqIHt6JAWfWu9Rhg==",
+      "license": "MIT",
+      "dependencies": {
+        "@lezer/common": "^1.2.0",
+        "@lezer/highlight": "^1.0.0",
+        "@lezer/lr": "^1.0.0"
+      }
+    },
     "node_modules/@modelcontextprotocol/sdk": {
       "version": "1.20.2",
       "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.20.2.tgz",
@@ -21149,6 +21238,14 @@
         "@boudra/expo-two-way-audio": "^0.1.3",
         "@expo/vector-icons": "^15.0.2",
         "@gorhom/bottom-sheet": "^5.2.6",
+        "@lezer/common": "^1.5.0",
+        "@lezer/css": "^1.3.0",
+        "@lezer/highlight": "^1.2.3",
+        "@lezer/html": "^1.3.13",
+        "@lezer/javascript": "^1.5.4",
+        "@lezer/json": "^1.0.3",
+        "@lezer/markdown": "^1.6.2",
+        "@lezer/python": "^1.1.18",
         "@react-native-async-storage/async-storage": "2.2.0",
         "@react-navigation/bottom-tabs": "^7.4.0",
         "@react-navigation/elements": "^2.6.3",