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/google/google.go

@@ -57,14 +57,17 @@ func deferClose(cl io.Closer) {
 func (c Config) Search(ctx context.Context, b extractor.Browser, query string) ([]Result, error) {
 	c = c.validate()
 
-	u, err := url.Parse(fmt.Sprintf("https://%s/search?q=%s", c.BaseURL, query))
+	u, err := url.Parse(fmt.Sprintf("https://%s/search", c.BaseURL))
 
 	if err != nil {
 		return nil, fmt.Errorf("invalid url: %w", err)
 	}
 
+	vals := u.Query()
+	vals.Set("q", query)
+
 	if c.Language != "" {
-		u.Query().Set("hl", c.Language)
+		vals.Set("hl", c.Language)
 	}
 
 	if c.Country != "" {
@@ -84,10 +87,12 @@ func (c Config) Search(ctx context.Context, b extractor.Browser, query string) (
 		}
 
 		if country != "" {
-			u.Query().Set("cr", country)
+			vals.Set("cr", country)
 		}
 	}
 
+	u.RawQuery = vals.Encode()
+
 	doc, err := b.Open(ctx, u.String(), extractor.OpenPageOptions{})
 
 	if err != nil {