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_storage_test.go

@@ -0,0 +1,65 @@
+package firefox
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestExtractLocalStorage(t *testing.T) {
+	path := createTestDB(t, "webappsstore.sqlite", []string{webappsstore2Schema},
+		insertWebappsstore("moc.buhtig.:https:443", "theme", "dark"),
+		insertWebappsstore("moc.buhtig.:https:443", "lang", "en"),
+		insertWebappsstore("moc.elpmaxe.:http:8080", "token", "abc123"),
+	)
+
+	got, err := extractLocalStorage(path)
+	require.NoError(t, err)
+	require.Len(t, got, 3)
+
+	// Verify field mapping by collecting into lookup
+	byKey := map[string]string{}
+	for _, entry := range got {
+		byKey[entry.URL+"/"+entry.Key] = entry.Value
+	}
+	assert.Equal(t, "dark", byKey["https://github.com:443/theme"])
+	assert.Equal(t, "en", byKey["https://github.com:443/lang"])
+	assert.Equal(t, "abc123", byKey["http://example.com:8080/token"])
+}
+
+func TestParseOriginKey(t *testing.T) {
+	tests := []struct {
+		name      string
+		originKey string
+		want      string
+	}{
+		{
+			name:      "https with port",
+			originKey: "moc.buhtig.:https:443",
+			want:      "https://github.com:443",
+		},
+		{
+			name:      "http with non-standard port",
+			originKey: "moc.elpmaxe.:http:8080",
+			want:      "http://example.com:8080",
+		},
+		{
+			name:      "no port",
+			originKey: "moc.elpmaxe.:https",
+			want:      "https://example.com",
+		},
+		{
+			name:      "invalid format",
+			originKey: "something",
+			want:      "something",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := parseOriginKey(tt.originKey)
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}