Move files tab and file pages to be accessible via contracts (#27)

* feat: remove Files from top-level navigation

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

* feat: update file links to use contract-scoped routes

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

* feat: add contract context to FileDetail component

- Add contractId, contractName, and onContractClick props to FileDetailProps
- Update breadcrumb navigation to show contract name with path separator
  when viewing file within a contract context
- Fall back to "Back to list" when no contract context is provided
- This enables the FileDetail component to be used within the
  /contracts/:contractId/files/:fileId route

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

* feat: update routes to nest files under contracts

- Add react-router-dom for client-side routing
- Create ContractList component to list all contracts
- Create ContractDetail component with tabs (overview, files, tasks, repos)
- Create FileDetail component to view individual files
- Configure routes:
  - /contracts - list all contracts
  - /contracts/:id - view contract details with Files tab
  - /contracts/:contractId/files/:fileId - view file in contract context
- Remove standalone file routes (/files, /files/:id)

Files are now only accessible through their parent contract.

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

* Task completion checkpoint

* Task completion checkpoint

* Task completion checkpoint

* Task completion checkpoint

* Task completion checkpoint

* Task completion checkpoint

* Task completion checkpoint

* Task completion checkpoint

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index d7c37c7..230ed07 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -13,6 +13,7 @@
         "nanostores": "^1.0.1",
         "react": "^18.3.1",
         "react-dom": "^18.3.1",
+        "react-router-dom": "^6.22.0",
         "three": "^0.180.0"
       },
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@@ -65,6 +66,7 @@
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+      "peer": true,
       "dependencies": {
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         "@babel/code-frame": "^7.27.1",
@@ -726,6 +728,15 @@
         "react": ">=18.0.0"
       }
     },
+    "node_modules/@remix-run/router": {
+      "version": "1.23.2",
+      "resolved": "https://registry.npmjs.org/@remix-run/router/-/router-1.23.2.tgz",
+      "integrity": "sha512-Ic6m2U/rMjTkhERIa/0ZtXJP17QUi2CbWE7cqx4J58M8aA3QTfW+2UlQ4psvTX9IO1RfNVhK3pcpdjej7L+t2w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
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+    },
     "node_modules/@rolldown/pluginutils": {
       "version": "1.0.0-beta.27",
       "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-beta.27.tgz",
@@ -1049,6 +1060,7 @@
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+      "peer": true,
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@@ -1064,6 +1076,7 @@
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+      "peer": true,
       "dependencies": {
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@@ -1146,6 +1159,7 @@
           "url": "https://github.com/sponsors/ai"
         }
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+      "peer": true,
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@@ -1377,6 +1391,7 @@
           "url": "https://github.com/sponsors/ai"
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+      "peer": true,
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@@ -1425,6 +1440,7 @@
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+      "peer": true,
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@@ -1436,6 +1452,7 @@
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+      "peer": true,
       "dependencies": {
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         "scheduler": "^0.23.2"
@@ -1453,6 +1470,38 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/react-router": {
+      "version": "6.30.3",
+      "resolved": "https://registry.npmjs.org/react-router/-/react-router-6.30.3.tgz",
+      "integrity": "sha512-XRnlbKMTmktBkjCLE8/XcZFlnHvr2Ltdr1eJX4idL55/9BbORzyZEaIkBFDhFGCEWBBItsVrDxwx3gnisMitdw==",
+      "license": "MIT",
+      "dependencies": {
+        "@remix-run/router": "1.23.2"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=16.8"
+      }
+    },
+    "node_modules/react-router-dom": {
+      "version": "6.30.3",
+      "resolved": "https://registry.npmjs.org/react-router-dom/-/react-router-dom-6.30.3.tgz",
+      "integrity": "sha512-pxPcv1AczD4vso7G4Z3TKcvlxK7g7TNt3/FNGMhfqyntocvYKj+GCatfigGDjbLozC4baguJ0ReCigoDJXb0ag==",
+      "license": "MIT",
+      "dependencies": {
+        "@remix-run/router": "1.23.2",
+        "react-router": "6.30.3"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=16.8",
+        "react-dom": ">=16.8"
+      }
+    },
     "node_modules/rollup": {
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       "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.49.0.tgz",
@@ -1577,6 +1626,7 @@
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       "dev": true,
+      "peer": true,
       "dependencies": {
         "esbuild": "^0.21.3",
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