feat(p2p): add Phase 3 dispute system components

- Add DisputeModal.tsx with reason selection, evidence upload, terms acceptance
- Add P2PDispute.tsx page with evidence gallery, status timeline, real-time updates
- Integrate dispute button in P2PTrade.tsx
- Add /p2p/dispute/:disputeId route to App.tsx
- Add P2P test suite with MockStore pattern (32 tests passing)
- Update P2P-BUILDING-PLAN.md with Phase 3 progress (70% complete)
- Fix lint errors in test files and components

web/package-lock.json

@@ -83,6 +83,7 @@
         "@tailwindcss/typography": "^0.5.16",
         "@testing-library/jest-dom": "^6.9.1",
         "@testing-library/react": "^16.3.0",
+        "@testing-library/user-event": "^14.6.1",
         "@types/node": "^22.5.5",
         "@types/qrcode": "^1.5.6",
         "@types/react": "^18.3.3",
@@ -3304,6 +3305,20 @@
         }
       }
     },
+    "node_modules/@testing-library/user-event": {
+      "version": "14.6.1",
+      "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-14.6.1.tgz",
+      "integrity": "sha512-vq7fv0rnt+QTXgPxr5Hjc210p6YKq2kmdziLgnsZGgLJ9e6VAShx1pACLuRjd/AS/sr7phAR58OIIpf0LlmQNw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12",
+        "npm": ">=6"
+      },
+      "peerDependencies": {
+        "@testing-library/dom": ">=7.21.4"
+      }
+    },
     "node_modules/@types/aria-query": {
       "version": "5.0.4",
       "resolved": "https://registry.npmjs.org/@types/aria-query/-/aria-query-5.0.4.tgz",