fix(flashcard): name the Anki deck from #+TITLE, not the filename

flashcard-to-anki.py's default_deck_name returned the input basename, so a deck built through flashcard-sync (which passes no --deck) was named after the file slug (refutation-drill) instead of the curated #+TITLE the phone deck should read (Refutations). flashcard-review.org already documented the #+TITLE behavior, and the script never matched it. default_deck_name now scans for a #+TITLE line (case-insensitive, trimmed) and falls back to the basename when there's none.

Five new tests cover title-drives-name, trimming, case-insensitivity, and the two basename fallbacks. The two old tests that asserted basename-always are replaced. The pre-staged script and test (validated 2026-06-21) applied cleanly red-to-green; their redundant copies are removed and the rationale doc kept.

Migration: deck IDs derive from the name, so decks previously built without --deck land as new decks on the next import. Old basename-named decks keep their history and can be deleted by hand.

Claude-Session: https://claude.ai/code/session_017PtX1nt1rtYVATuzmzBS4f

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