Migration research-sentry to Tinyfish SDK

[KrishnaAgarwal7531]

Migrates Research Sentry to the official TinyFish SDK and fixes the error handling that was swallowing all failure modes as silent null returns. The library now throws a typed TinyFishError with a code field — missing key, run failed, timeout, stream error, and no result are all distinguishable by the caller.
Also cleans up leftover traces of the old OpenAI dependency — the app uses Groq for all LLM calls and transcription (including Whisper via Groq's endpoint), not OpenAI. README, tech stack table, and env file all updated to reflect this. .env.local.example renamed to .env.example per the cookbook convention, and bare .env added to .gitignore so a cp .env.example .env workflow doesn't leak keys.

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[simantak-dabhade]

Clean migration. Fixed optional chaining on comparison.points, removed next-env.d.ts, fixed README typos. Build passes.