feat: implement batch job fetching with get_jobs_batch contract function

[TOS1ANO]

Linked Issue

Closes #587 [SC-101]

What Changed

Smart Contract

• Added get_jobs_batch(start, limit) public view function returning Vec<Job>
• Skips non-existent IDs safely (no panic) using Option<Job> pattern
• Handles edge cases: start=0, limit=0, start > count
• Backward compatible — get_job(id) kept unchanged

Frontend

• Added getJobsBatch(startId, limit) helper in lib/contract.ts
• Replaced N×getJob(id) loops with single batch calls on:
  • Home page
  • Dashboard (main fetch + bookmarked jobs)
  • Transactions page
  • Profile page
  • Compare page
  • Disputes loader

Bug Fixes

• Fixed malformed JSX in layout.tsx (swapped closing tags for TypographyProvider/NetworkProvider)
• Fixed missing </div> in ToastProvider.tsx causing JSX parse error
• Moved SSR-disabled dynamic imports into ClientComponents.tsx to comply with Next.js App Router Server Component rules

Validation

• TypeScript check passes with no new errors
• Dev server starts without compilation errors
• Contract function follows existing patterns
• Backward compatible — individual getJob unchanged

Additional Notes

• The ToastProvider.tsx now has two separate rendering containers for toasts (preserved existing behavior, only syntax fixed)

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[anumukul]

@TOS1ANO please resolve conflicts