docs(changelog): LastPass CSV importer (Plan 3B)

Documents `relicario import lastpass <csv>` and the vault-tab
Import panel under Unreleased / Added.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

CHANGELOG.md

@@ -40,6 +40,20 @@
   passphrase + new-remote config and writes the vault into a fresh
   empty repo (refuses to clobber existing). Git history is never
   bundled from the extension — CLI is the source of full backups.
+- **LastPass CSV import.** New `relicario import lastpass <csv>`
+  command + vault-tab Import panel (`vault.html#import`).
+  Logins map to `Login` items; rows with `url == "http://sn"`
+  map to `SecureNote` (extra column → body verbatim, structured
+  data preserved as-is for manual re-categorization). TOTP
+  secrets in the `totp` column are base32-decoded into
+  `LoginCore.totp`; bad base32 surfaces a warning and the login
+  is imported without TOTP. Failed rows (missing `name`, missing
+  password on a login) are skipped with a per-row warning.
+  Each row gets a freshly-minted ID — re-running the import
+  creates duplicates rather than corrupting state.
+- **Popup deep link to the Import panel.** `settings-vault`
+  gains an "import" section with a `LastPass CSV →` button
+  next to the existing `Backup & restore →` button.
 - **`relicario status` shows last export age.** New `Last export:
   <human-readable>` line reading `.relicario/last_backup` (a marker
   file `cmd_backup_export` writes on success). Reads "never" for