Improve workspace/chat diff viewer with syntax highlighting & per-file view

Replace the raw single-blob diff dump (Monaco, language=diff) and the plain
<pre> file diffs in chat with @git-diff-view/react:
- Parse the unified git diff into structured per-file entries (status,
  +/- counts, binary detection) via parseDiffFiles()
- Workspace Diff tab: collapsible per-file cards with status badges, line
  counts, syntax highlighting, and a Unified/Split toggle
- Agent chat: render each change's diff highlighted instead of plain text
- Theme follows next-themes resolvedTheme (light/dark)

bun.lock

@@ -97,6 +97,7 @@
       "version": "0.1.0",
       "dependencies": {
         "@convex-dev/auth": "catalog:convex",
+        "@git-diff-view/react": "^0.1.6",
         "@monaco-editor/react": "latest",
         "@sentry/nextjs": "^10.46.0",
         "@spoon/backend": "workspace:*",
@@ -705,6 +706,12 @@
 
     "@floating-ui/utils": ["@floating-ui/utils@0.2.11", "", {}, "sha512-RiB/yIh78pcIxl6lLMG0CgBXAZ2Y0eVHqMPYugu+9U0AeT6YBeiJpf7lbdJNIugFP5SIjwNRgo4DhR1Qxi26Gg=="],
 
+    "@git-diff-view/core": ["@git-diff-view/core@0.1.6", "", { "dependencies": { "@git-diff-view/lowlight": "^0.1.6", "fast-diff": "^1.3.0", "highlight.js": "^11.11.0", "lowlight": "^3.3.0" } }, "sha512-q2Ch8jURF6pL7VeNpOgHBRVY9gsGLXCOYpKXHG3BqpXe0kv6GNSUux8SmAYsDrakBzfgDClODxDtsM2rfiWpnA=="],
+
+    "@git-diff-view/lowlight": ["@git-diff-view/lowlight@0.1.6", "", { "dependencies": { "@types/hast": "^3.0.0", "highlight.js": "^11.11.0", "lowlight": "^3.3.0" } }, "sha512-YIsiAc2aWAePWaDNi3k8xI0Vs/ZItt5J6nrftTIFbMFN3GwDOsyJFm2L7o8XWKTJkV2yItaz28KUI9CWj0MVZA=="],
+
+    "@git-diff-view/react": ["@git-diff-view/react@0.1.6", "", { "dependencies": { "@git-diff-view/core": "^0.1.6", "@types/hast": "^3.0.0", "fast-diff": "^1.3.0", "highlight.js": "^11.11.0", "lowlight": "^3.3.0", "reactivity-store": "^0.4.0", "use-sync-external-store": "^1.6.0" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0", "react-dom": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-koABBon5bNKh6/WnWSxggK9ojw+cvWAPnY2/ciOkwlR+8dm0h6A7Qa5kP2HFDxqYHwZ2imkGMcSLgXMOnWHRFA=="],
+
     "@hookform/resolvers": ["@hookform/resolvers@5.2.2", "", { "dependencies": { "@standard-schema/utils": "^0.3.0" }, "peerDependencies": { "react-hook-form": "^7.55.0" } }, "sha512-A/IxlMLShx3KjV/HeTcTfaMxdwy690+L/ZADoeaTltLx+CVuzkeVIPuybK3jrRfw7YZnmdKsVVHAlEPIAEUNlA=="],
 
     "@humanfs/core": ["@humanfs/core@0.19.1", "", {}, "sha512-5DyQ4+1JEUzejeK1JGICcideyfUbGixgS9jNgex5nqkW+cY7WZhxBigmieN5Qnw9ZosSNVC9KQKyb+GUaGyKUA=="],
@@ -1525,6 +1532,8 @@
 
     "@types/hammerjs": ["@types/hammerjs@2.0.46", "", {}, "sha512-ynRvcq6wvqexJ9brDMS4BnBLzmr0e14d6ZJTEShTBWKymQiHwlAyGu0ZPEFI2Fh1U53F7tN9ufClWM5KvqkKOw=="],
 
+    "@types/hast": ["@types/hast@3.0.4", "", { "dependencies": { "@types/unist": "*" } }, "sha512-WPs+bbQw5aCj+x6laNGWLH3wviHtoCv/P3+otBhbOhJgG8qtpdAMlTCxLtsTWA7LH1Oh/bFCHsBn0TPS5m30EQ=="],
+
     "@types/istanbul-lib-coverage": ["@types/istanbul-lib-coverage@2.0.6", "", {}, "sha512-2QF/t/auWm0lsy8XtKVPG19v3sSOQlJe/YHZgfjb/KBBHOGSV+J2q/S671rcq9uTBrLAXmZpqJiaQbMT+zNU1w=="],
 
     "@types/istanbul-lib-report": ["@types/istanbul-lib-report@3.0.3", "", { "dependencies": { "@types/istanbul-lib-coverage": "*" } }, "sha512-NQn7AHQnk/RSLOxrBbGyJM/aVQ+pjj5HCgasFxc0K/KhoATfQ/47AyUl15I2yBUpihjmas+a+VJBOqecrFH+uA=="],
@@ -1553,6 +1562,8 @@
 
     "@types/trusted-types": ["@types/trusted-types@2.0.7", "", {}, "sha512-ScaPdn1dQczgbl0QFTeTOmVHFULt394XJgOQNoyVhZ6r2vLnMLJfBPd53SB52T/3G36VI1/g2MZaX0cwDuXsfw=="],
 
+    "@types/unist": ["@types/unist@3.0.3", "", {}, "sha512-ko/gIFJRv177XgZsZcBwnqJN5x/Gien8qNOn0D5bQU/zAzVf9Zt3BlcUiLqhV9y4ARk0GbT3tnUiPNgnTXzc/Q=="],
+
     "@types/use-sync-external-store": ["@types/use-sync-external-store@0.0.6", "", {}, "sha512-zFDAD+tlpf2r4asuHEj0XH6pY6i0g5NeAHPn+15wk3BV6JA69eERFXC1gyGThDkVa1zCyKr5jox1+2LbV/AMLg=="],
 
     "@types/whatwg-mimetype": ["@types/whatwg-mimetype@3.0.2", "", {}, "sha512-c2AKvDT8ToxLIOUlN51gTiHXflsfIFisS4pO7pDPoKouJCESkhZnEy623gwP9laCy5lnLDAw1vAzu2vM2YLOrA=="],
@@ -1605,6 +1616,10 @@
 
     "@vitest/utils": ["@vitest/utils@4.1.9", "", { "dependencies": { "@vitest/pretty-format": "4.1.9", "convert-source-map": "^2.0.0", "tinyrainbow": "^3.1.0" } }, "sha512-A51o8ymO5PpqlWNnBP9ZHPXDIpuMtTLlGSjN7la4US+LJzoUMyhwjA5QXlm39JexgwHKW4Xjs8Z2d3dLCXOeuA=="],
 
+    "@vue/reactivity": ["@vue/reactivity@3.5.38", "", { "dependencies": { "@vue/shared": "3.5.38" } }, "sha512-pG6LV/NDNRbKizcUjFFLAfjaL8mcv4DmR9avNcUw2gDHBzZneuS2TWCmp633ynzxz9YYKNeEPK2I8Wraqy2HUQ=="],
+
+    "@vue/shared": ["@vue/shared@3.5.38", "", {}, "sha512-FTW0AFZNaK5/mOqvGBwVfUlNLU38TiQn4+DQgIFUnrBBJQ1crMJ82yeGQLV5jyKFsO8yRukpbuP7x+nRbH6aug=="],
+
     "@webassemblyjs/ast": ["@webassemblyjs/ast@1.14.1", "", { "dependencies": { "@webassemblyjs/helper-numbers": "1.13.2", "@webassemblyjs/helper-wasm-bytecode": "1.13.2" } }, "sha512-nuBEDgQfm1ccRp/8bCQrx1frohyufl4JlbMMZ4P1wpeOfDhF6FQkxZJ1b/e+PLwr6X1Nhw6OLme5usuBWYBvuQ=="],
 
     "@webassemblyjs/floating-point-hex-parser": ["@webassemblyjs/floating-point-hex-parser@1.13.2", "", {}, "sha512-6oXyTOzbKxGH4steLbLNOu71Oj+C8Lg34n6CqRvqfS2O71BxY6ByfMDRhBytzknj9yGUPVJ1qIKhRlAwO1AovA=="],
@@ -1965,6 +1980,8 @@
 
     "detect-node-es": ["detect-node-es@1.1.0", "", {}, "sha512-ypdmJU/TbBby2Dxibuv7ZLW3Bs1QEmM7nHjEANfohJLvE0XVujisn1qPJcZxg+qDucsr+bP6fLD1rPS3AhJ7EQ=="],
 
+    "devlop": ["devlop@1.1.0", "", { "dependencies": { "dequal": "^2.0.0" } }, "sha512-RWmIqhcFf1lRYBvNmr7qTNuyCt/7/ns2jbpp1+PalgE/rDQcBT0fioSMUpJ93irlUhC5hrg4cYqe6U+0ImW0rA=="],
+
     "doctrine": ["doctrine@2.1.0", "", { "dependencies": { "esutils": "^2.0.2" } }, "sha512-35mSku4ZXK0vfCuHEDAwt55dg2jNajHZ1odvF+8SSr82EsZY4QmXfuWso8oEd8zRhVObSN18aM0CjSdoBX7zIw=="],
 
     "dom-accessibility-api": ["dom-accessibility-api@0.6.3", "", {}, "sha512-7ZgogeTnjuHbo+ct10G9Ffp0mif17idi0IyWNVA/wcwcm7NPOD/WEHVP3n7n3MhXqxoIYm8d6MuZohYWIZ4T3w=="],
@@ -2157,6 +2174,8 @@
 
     "fast-deep-equal": ["fast-deep-equal@3.1.3", "", {}, "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q=="],
 
+    "fast-diff": ["fast-diff@1.3.0", "", {}, "sha512-VxPP4NqbUjj6MaAOafWeUn2cXWLcCtljklUtZf0Ind4XQ+QPtmA0b18zZy0jIQx+ExRVCR/ZQpBmik5lXshNsw=="],
+
     "fast-glob": ["fast-glob@3.3.1", "", { "dependencies": { "@nodelib/fs.stat": "^2.0.2", "@nodelib/fs.walk": "^1.2.3", "glob-parent": "^5.1.2", "merge2": "^1.3.0", "micromatch": "^4.0.4" } }, "sha512-kNFPyjhh5cKjrUltxs+wFx+ZkbRaxxmZ+X0ZU31SOsxCEtP9VPgtq2teZw1DebupL5GmDaNQ6yKMMVcM41iqDg=="],
 
     "fast-json-stable-stringify": ["fast-json-stable-stringify@2.1.0", "", {}, "sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw=="],
@@ -2277,6 +2296,8 @@
 
     "hermes-parser": ["hermes-parser@0.25.1", "", { "dependencies": { "hermes-estree": "0.25.1" } }, "sha512-6pEjquH3rqaI6cYAXYPcz9MS4rY6R4ngRgrgfDshRptUZIc3lw0MCIJIGDj9++mfySOuPTHB4nrSW99BCvOPIA=="],
 
+    "highlight.js": ["highlight.js@11.11.1", "", {}, "sha512-Xwwo44whKBVCYoliBQwaPvtd/2tYFkRQtXDWj1nackaV2JPXx3L0+Jvd8/qCJ2p+ML0/XVkJ2q+Mr+UVdpJK5w=="],
+
     "hoist-non-react-statics": ["hoist-non-react-statics@3.3.2", "", { "dependencies": { "react-is": "^16.7.0" } }, "sha512-/gGivxi8JPKWNm/W0jSmzcMPpfpPLc3dY/6GxhX2hQ9iGj3aDfklV4ET7NjKpSinLpJ5vafa9iiGIEZg10SfBw=="],
 
     "hosted-git-info": ["hosted-git-info@7.0.2", "", { "dependencies": { "lru-cache": "^10.0.1" } }, "sha512-puUZAUKT5m8Zzvs72XWy3HtvVbTWljRE66cP60bxJzAqf2DgICo7lYTY2IHUmLnNpjYvw5bvmoHvPc0QO2a62w=="],
@@ -2535,6 +2556,8 @@
 
     "loose-envify": ["loose-envify@1.4.0", "", { "dependencies": { "js-tokens": "^3.0.0 || ^4.0.0" }, "bin": { "loose-envify": "cli.js" } }, "sha512-lyuxPGr/Wfhrlem2CL/UcnUc1zcqKAImBDzukY7Y5F/yQiNdko6+fRLevlw1HgMySw7f611UIY408EtxRSoK3Q=="],
 
+    "lowlight": ["lowlight@3.3.0", "", { "dependencies": { "@types/hast": "^3.0.0", "devlop": "^1.0.0", "highlight.js": "~11.11.0" } }, "sha512-0JNhgFoPvP6U6lE/UdVsSq99tn6DhjjpAj5MxG49ewd2mOBVtwWYIT8ClyABhq198aXXODMU6Ox8DrGy/CpTZQ=="],
+
     "lru-cache": ["lru-cache@11.5.1", "", {}, "sha512-RPimw/7aMdv2oqRrxKwvZXcPfwBrn/JZ2xYcY9Hus/6LaS3VOAKVWKWgNLCFSiOm1ESXinjsDlidVU7JlnCN2A=="],
 
     "lucia": ["lucia@3.2.2", "", { "dependencies": { "@oslojs/crypto": "^1.0.1", "@oslojs/encoding": "^1.1.0" } }, "sha512-P1FlFBGCMPMXu+EGdVD9W4Mjm0DqsusmKgO7Xc33mI5X1bklmsQb0hfzPhXomQr9waWIBDsiOjvr1e6BTaUqpA=="],
@@ -2877,6 +2900,8 @@
 
     "react-style-singleton": ["react-style-singleton@2.2.3", "", { "dependencies": { "get-nonce": "^1.0.0", "tslib": "^2.0.0" }, "peerDependencies": { "@types/react": "*", "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc" }, "optionalPeers": ["@types/react"] }, "sha512-b6jSvxvVnyptAiLjbkWLE/lOnR4lfTtDAl+eUC7RZy+QQWc6wRzIV2CE6xBuMmDxc2qIihtDCZD5NPOFl7fRBQ=="],
 
+    "reactivity-store": ["reactivity-store@0.4.0", "", { "dependencies": { "@vue/reactivity": "~3.5.30", "@vue/shared": "~3.5.30", "use-sync-external-store": "^1.6.0" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-uL9uoREOBg2o4zUa8vMU0AbvAOk0osPloizscmyZqMvJzcuuKX3ELFYYr1DX8gAcfvlhPduz4QuLZn1eChCu4Q=="],
+
     "readdirp": ["readdirp@4.1.2", "", {}, "sha512-GDhwkLfywWL2s6vEjyhri+eXmfH6j1L7JE27WhqLeYzoh/A3DBaYGEj2H/HFZCn/kMfim73FXxEJTw06WtxQwg=="],
 
     "recharts": ["recharts@3.8.1", "", { "dependencies": { "@reduxjs/toolkit": "^1.9.0 || 2.x.x", "clsx": "^2.1.1", "decimal.js-light": "^2.5.1", "es-toolkit": "^1.39.3", "eventemitter3": "^5.0.1", "immer": "^10.1.1", "react-redux": "8.x.x || 9.x.x", "reselect": "5.1.1", "tiny-invariant": "^1.3.3", "use-sync-external-store": "^1.2.2", "victory-vendor": "^37.0.2" }, "peerDependencies": { "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0", "react-dom": "^16.0.0 || ^17.0.0 || ^18.0.0 || ^19.0.0", "react-is": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-mwzmO1s9sFL0TduUpwndxCUNoXsBw3u3E/0+A+cLcrSfQitSG62L32N69GhqUrrT5qKcAE3pCGVINC6pqkBBQg=="],