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/megamillions/megamillions.go

@@ -64,7 +64,6 @@ func getDrawing(_ context.Context, doc extractor.Document) (*Drawing, error) {
 		return nil, fmt.Errorf("failed to parse date: %w", err)
 	}
 
-	fmt.Println("ticks", ticks)
 	drawing.Date = netTicksToTime(ticks)
 
 	err = doc.ForEach("ul.numbers li.ball", func(n extractor.Node) error {
@@ -199,23 +198,12 @@ func getNextDrawing(_ context.Context, doc extractor.Document) (*NextDrawing, er
 
 	numeric := numericOnly(txt)
 
-	set := false
 	if strings.Contains(txt, "Billion") {
-		amt := currency.USD.Amount(numeric * 1000000000)
-		nextDrawing.Jackpot = amt
-		set = true
+		nextDrawing.Jackpot = currency.USD.Amount(numeric * 1000000000)
 	} else if strings.Contains(txt, "Million") {
-		amt := currency.USD.Amount(numeric * 1000000)
-		nextDrawing.Jackpot = amt
-		set = true
+		nextDrawing.Jackpot = currency.USD.Amount(numeric * 1000000)
 	} else {
-		amt := currency.USD.Amount(numeric)
-		nextDrawing.Jackpot = amt
-		set = true
-	}
-
-	if !set {
-		return nil, fmt.Errorf("failed to convert jackpot to currency: %w", err)
+		nextDrawing.Jackpot = currency.USD.Amount(numeric)
 	}
 
 	return &nextDrawing, nil