feat: add Firefox extract methods and complete data model fields (#527)

* feat: add Firefox extract methods and complete data model fields

Firefox extract methods:
- extractPasswords: JSON + ASN1PBE decryption via decryptPBE helper
- extractCookies: SQLite, plaintext (no encryption), journalOff
- extractHistories: SQLite, visit count ASC sort (matches old behavior)
- extractDownloads: SQLite, moz_annos JOIN with JSON content parsing
- extractBookmarks: SQLite, moz_bookmarks JOIN moz_places
- extractExtensions: JSON, filter by location=app-profile
- extractLocalStorage: SQLite webappsstore2, reversed originKey parsing

Complete data model fields (union of Chromium and Firefox):
- CookieEntry: add HasExpire, IsPersistent
- DownloadEntry: add MimeType
- CreditCardEntry: add NickName, Address
- ExtensionEntry: add HomepageURL, Enabled

Update Chromium extractors to populate new fields:
- extract_cookie.go: fill HasExpire, IsPersistent
- extract_download.go: SELECT and fill mime_type
- extract_creditcard.go: SELECT nickname, billing_address_id
- extract_extension.go: fill HomepageURL, Enabled (state==1)

Tests:
- Full test coverage for all 7 Firefox extract functions
- Password test uses known ASN1PBE test vectors from crypto package
- Table-driven tests for parseOriginKey
- Updated Chromium tests for new fields

* fix: add COALESCE for nullable bookmark title in Firefox query

Firefox moz_bookmarks.title can be NULL (PR #500 fixed this in old code).
Add COALESCE to handle NULL gracefully in SQL instead of relying on
driver-specific NULL→string conversion behavior.

* fix: enable journalOff for all Firefox SQLite extractors and populate cookie flags

- Set journalOff=true for extract_history, extract_download, extract_bookmark
  (Firefox databases require PRAGMA journal_mode=off to avoid lock errors)
- Populate HasExpire and IsPersistent for Firefox cookies (derived from expiry>0)
- Add test assertions for HasExpire/IsPersistent in both Chromium and Firefox

browser/chromium/extract_cookie.go

@@ -34,14 +34,16 @@ func extractCookies(masterKey []byte, path string) ([]types.CookieEntry, error)
 			value, _ := decryptValue(masterKey, encryptedValue)
 			value = stripCookieHash(value, host)
 			return types.CookieEntry{
-				Name:       name,
-				Host:       host,
-				Path:       cookiePath,
-				Value:      string(value),
-				IsSecure:   isSecure != 0,
-				IsHTTPOnly: isHTTPOnly != 0,
-				ExpireAt:   typeutil.TimeEpoch(expireAt),
-				CreatedAt:  typeutil.TimeEpoch(createdAt),
+				Name:         name,
+				Host:         host,
+				Path:         cookiePath,
+				Value:        string(value),
+				IsSecure:     isSecure != 0,
+				IsHTTPOnly:   isHTTPOnly != 0,
+				HasExpire:    hasExpire != 0,
+				IsPersistent: isPersistent != 0,
+				ExpireAt:     typeutil.TimeEpoch(expireAt),
+				CreatedAt:    typeutil.TimeEpoch(createdAt),
 			}, nil
 		})
 	if err != nil {