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/firefox/extract_cookie_test.go

@@ -0,0 +1,35 @@
+package firefox
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestExtractCookies(t *testing.T) {
+	path := createTestDB(t, "cookies.sqlite", []string{mozCookiesSchema},
+		insertMozCookie("session", "abc123", ".example.com", "/", 1700000000000000, 1800000000, 1, 1),
+		insertMozCookie("token", "xyz789", ".new.com", "/api", 1710000000000000, 1810000000, 1, 0),
+	)
+
+	got, err := extractCookies(path)
+	require.NoError(t, err)
+	require.Len(t, got, 2)
+
+	// Verify sort order: creation time descending
+	assert.Equal(t, ".new.com", got[0].Host)
+	assert.Equal(t, ".example.com", got[1].Host)
+
+	// Verify field mapping — Firefox cookies are plaintext
+	assert.Equal(t, "token", got[0].Name)
+	assert.Equal(t, "xyz789", got[0].Value)
+	assert.Equal(t, "/api", got[0].Path)
+	assert.True(t, got[0].IsSecure)
+	assert.False(t, got[0].IsHTTPOnly)
+	assert.True(t, got[0].HasExpire)    // expiry > 0
+	assert.True(t, got[0].IsPersistent) // expiry > 0
+
+	assert.Equal(t, "abc123", got[1].Value)
+	assert.True(t, got[1].IsHTTPOnly)
+}