fix: select popular subview across phrase batches

[axisrow]

Summary

• target the Popular subview instead of the shared Table parent when selecting views
• reset to the table view after phrase changes so subview controls are present
• fail closed when CSV metadata does not contain the requested quoted phrase

Fixes #41

Tests

• ruff check src tests
• pytest -q (188 passed before live-only run; 188 current suite)
• live 3-phrase batch on Chrome :9223 with keep-raw: top headers matched each requested view and phrase

Notes

• No basename contract was added.
• Live CLI batch had one unrelated transient phrase-entry failure on the first phrase; the delayed live harness completed all 3 phrases and all 4 views with correct headers.
• Chrome :9222 and ~/Downloads were not touched.

[axisrow]

Verdict

Approved / ready. I found no high-confidence correctness, security, or error-handling issue in the diff against main. The new selector reset is consistent with the phrase-batch state transition, and the metadata guard is covered for matching, mismatching, and legacy two-column exports.