feat: add Chromium Browser with new v2 architecture (#530)

* feat: add Chromium Browser implementation with new architecture
* refactor: replace Walk with ReadDir+Stat for profile discovery
* refactor: remove queries override, use extractors for Yandex passwords
* refactor: remove dataSource wrapper, use []sourcePath directly
* fix: address Copilot review feedback on chromium_new.go
* fix: always call key retriever regardless of Local State existence

browser/firefox/source.go

@@ -1,21 +1,33 @@
 package firefox
 
-import "github.com/moond4rk/hackbrowserdata/types"
+import (
+	"path/filepath"
 
-// dataSource maps a Category to one or more candidate file paths within a profile directory.
+	"github.com/moond4rk/hackbrowserdata/types"
+)
+
+// sourcePath describes a single candidate location for browser data,
+// relative to the profile directory.
+type sourcePath struct {
+	rel   string // relative path from profileDir
+	isDir bool   // true for directory targets
+}
+
+func file(rel string) sourcePath { return sourcePath{rel: filepath.FromSlash(rel), isDir: false} }
+
+// dataSource holds one or more candidate sourcePaths in priority order.
 type dataSource struct {
-	paths []string // candidate relative paths in priority order
-	isDir bool     // true for directories (unused in Firefox, all sources are files)
+	candidates []sourcePath
 }
 
 // firefoxSources defines the Firefox file layout.
 // Firefox does not support SessionStorage or CreditCard extraction.
 var firefoxSources = map[types.Category]dataSource{
-	types.Password:     {paths: []string{"logins.json"}},
-	types.Cookie:       {paths: []string{"cookies.sqlite"}},
-	types.History:      {paths: []string{"places.sqlite"}},
-	types.Download:     {paths: []string{"places.sqlite"}}, // same file as History
-	types.Bookmark:     {paths: []string{"places.sqlite"}}, // same file as History
-	types.Extension:    {paths: []string{"extensions.json"}},
-	types.LocalStorage: {paths: []string{"webappsstore.sqlite"}},
+	types.Password:     {candidates: []sourcePath{file("logins.json")}},
+	types.Cookie:       {candidates: []sourcePath{file("cookies.sqlite")}},
+	types.History:      {candidates: []sourcePath{file("places.sqlite")}},
+	types.Download:     {candidates: []sourcePath{file("places.sqlite")}},
+	types.Bookmark:     {candidates: []sourcePath{file("places.sqlite")}},
+	types.Extension:    {candidates: []sourcePath{file("extensions.json")}},
+	types.LocalStorage: {candidates: []sourcePath{file("webappsstore.sqlite")}},
 }