Mocks sendMessage. Covers: file-picker fires
parse_lastpass_csv, preview text matches the parsed counts,
confirm fires import_lastpass_commit with the parsed items,
warnings render after import, cancel clears the preview.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
New vault.html#import panel with a file picker, parse-preview
("N logins, M notes, K skipped — proceed?"), confirm/cancel
buttons, inline progress, and a post-import warnings list. The
popup's settings-vault view links to it via a new
"LastPass CSV →" button next to "Backup & restore →".
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
