fix: bug fixes, test coverage, and CI workflow

- Fix Nodes.First() panic on empty slice (return nil)
- Fix ticker leak in archive.go (create once, defer Stop)
- Fix cookie path matching for empty and root paths
- Fix lost query params in google.go (u.Query().Set was discarded)
- Fix type assertion panic in useragents.go
- Fix dropped date parse error in powerball.go
- Remove unreachable dead code in megamillions.go and powerball.go
- Simplify document.go WaitForNetworkIdle, remove unused root field
- Remove debug fmt.Println calls across codebase
- Replace panic(err) with stderr+exit in all cmd/ programs
- Fix duckduckgo cmd: remove useless defer, return error on bad safesearch
- Fix archive cmd: ToConfig returns error instead of panicking
- Add 39+ unit tests across 6 new test files
- Add Gitea Actions CI workflow (build, test, vet in parallel)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

document.go

@@ -25,30 +25,22 @@ type document struct {
 	pw      *playwright.Playwright
 	browser playwright.Browser
 	page    playwright.Page
-	root    playwright.ElementHandle
 	locator playwright.Locator
 }
 
 func newDocument(pw *playwright.Playwright, browser playwright.Browser, page playwright.Page) (Document, error) {
-	root, err := page.QuerySelector("html")
-
-	if err != nil {
-		return nil, err
-	}
-
-	root2 := page.Locator("html")
+	locator := page.Locator("html")
 
 	res := &document{
 		node: node{
-			locator: root2,
+			locator: locator,
 		},
 		pw:      pw,
 		browser: browser,
 		page:    page,
-		root:    root,
 	}
 
-	slog.Info("new document", "url", page.URL(), "root", root, "locator", root2)
+	slog.Info("new document", "url", page.URL(), "locator", locator)
 
 	return res, nil
 }
@@ -78,21 +70,14 @@ func (d *document) Refresh() error {
 }
 
 func (d *document) WaitForNetworkIdle(timeout *time.Duration) error {
-
-	var f *float64 = nil
 	if timeout == nil {
 		t := 30 * time.Second
 		timeout = &t
 	}
 
-	if timeout != nil {
-		ms := float64(timeout.Milliseconds())
-		f = &ms
-	}
-
-	err := d.page.WaitForLoadState(playwright.PageWaitForLoadStateOptions{
+	ms := float64(timeout.Milliseconds())
+	return d.page.WaitForLoadState(playwright.PageWaitForLoadStateOptions{
 		State:   playwright.LoadStateNetworkidle,
-		Timeout: f,
+		Timeout: &ms,
 	})
-	return err
 }