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>

sites/archive/archive.go

@@ -130,10 +130,9 @@ func (c Config) Archive(ctx context.Context, b extractor.Browser, target string)
 
 	select {
 	case <-ctx.Done():
-		fmt.Println("context already done before entering the loop:", ctx.Err())
+		slog.Debug("context already done before entering the loop", "err", ctx.Err())
 		return nil, ctx.Err()
 	default:
-		fmt.Println("context not done yet")
 		// Proceed with the loop
 	}
 	// now we are waiting for archive.ph to archive the page and redirect us to the archived page
@@ -141,6 +140,9 @@ func (c Config) Archive(ctx context.Context, b extractor.Browser, target string)
 	// if the page path starts with /wip/ then we are still waiting
 	// also periodically refresh the page just in case
 
+	ticker := time.NewTicker(5 * time.Second)
+	defer ticker.Stop()
+
 	keepGoing := true
 	for keepGoing {
 		select {
@@ -148,14 +150,14 @@ func (c Config) Archive(ctx context.Context, b extractor.Browser, target string)
 			slog.Info("context done")
 			keepGoing = false
 
-		case <-time.NewTicker(5 * time.Second).C:
+		case <-ticker.C:
 			archivedUrl, err := url.Parse(doc.URL())
 
 			if err != nil {
 				continue
 			}
 
-			fmt.Println("checking url:", archivedUrl.String())
+			slog.Debug("checking url", "url", archivedUrl.String())
 			// if the url is not the same as the endpoint, or the path does not start with /wip/ or /submit then we are done
 			if archivedUrl.Hostname() != endpoint.Hostname() || (!strings.HasPrefix(archivedUrl.Path, "/wip/") && !strings.HasPrefix(archivedUrl.Path, "/submit")) {
 				keepGoing = false