fix(matrix): throttle room history backfill requests

[webguru-hypha]

Summary

• throttle Matrix room history backfill to prevent request spikes during chat initialization
• add bounded retry with rate-limit backoff when homeserver returns M_LIMIT_EXCEEDED
• stop backfill early when recent history is already loaded for the room

Test plan

• pnpm --filter @hypha-platform/core test
• pnpm exec prettier --check packages/core/src/matrix/client/providers/matrix-provider.tsx
• Manual review of loadRoomHistory flow for cooldown + adaptive stop conditions

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⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between 1c1063c and f879f4d.

📒 Files selected for processing (1)

• packages/core/src/matrix/client/providers/matrix-provider.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/matrix-history-rate-limit-backoff

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