Merge CSV downloads; fix UI rendering and prevent chat truncation

[reikland]

Motivation

• Fix SyntaxError and broken multiline string issues that caused the Streamlit UI to crash.
• Consolidate duplicated/garbled display code paths so the CSV and single-seed UIs render consistently.
• Prevent intermittent truncation of chat replies by ensuring prompts and token budgets are appropriate.
• Provide a single merged CSV export that preserves all resolution-card and question metadata without duplicate columns.

Description

• Repaired corrupted/duplicated UI blocks and fixed quoting/escaping in multiline st.markdown and st.code usages in app.py.
• Removed the duplicated Domain tags input and consolidated the CSV vs single-seed rendering flow to remove inconsistent branches.
• Relaxed the chat system prompt wording and increased max_tokens from 600 to 1200 for batch and single-seed chats to reduce truncated replies.
• Merged CSV downloads by attaching resolution_card data to the kept-questions batch export and to the proto-questions single-seed export (using session-state mapping), and updated download button labels accordingly.

Testing

• Ran python -m py_compile app.py and the file compiled successfully.
• No other automated tests were added or executed.

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Codex Task