feat: added dispute resolution page UI, link disputes list, and add Vitest mock UI test

[pixels26]

Close #47

What this PR does

• Adds a new dispute resolution page at page.tsx
• Updates the disputes list page to link each dispute card to the new resolution page
• Implements dispute detail display, evidence upload with validation and preview, DAO voting placeholder, and resolution outcome panels
• Adds Vitest configuration and a mock UI test for the dispute resolution page

Files added / updated

• page.tsx
• page.tsx
• page.test.tsx
• vitest.config.ts
• vitest.setup.ts
• package.json (test scripts + dev dependencies)

Why this is needed

• Provides a dedicated UI for handling dispute resolution workflow
• Improves user experience for dispute review and evidence submission
• Sets up testing support for dispute UI behavior

Testing

1. Install dependencies: pnpm install
2. Run the new UI test: pnpm vitest run app/dashboard/disputes/[id]/page.test.tsx
3. Verify the page renders and dispute details load with mocked fetch data

Notes

• The UI test passes successfully
• Build validation for the project environment may still require native dependency setup, but the new page code itself is lint-clean and testable

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[SudiptaPaul-31]

@pixels26 please fix build