fix: clear env vars in TestLoadFromFile to test pure config values

The sandbox had BRAVE_API_KEY set, causing the env override to win
over the config file value in the test assertion.

go.mod

@@ -4,7 +4,10 @@ go 1.25.0
 
 require (
 	github.com/BurntSushi/toml v1.5.0
-	github.com/PuerkitoBio/goquery v1.12.0 // indirect
+	github.com/PuerkitoBio/goquery v1.12.0
+)
+
+require (
 	github.com/andybalholm/cascadia v1.3.3 // indirect
 	golang.org/x/net v0.52.0 // indirect
 )

go.sum

@@ -1,3 +1,5 @@
+github.com/BurntSushi/toml v1.5.0 h1:W5quZX/G/csjUnuI8SUYlsHs9M38FC7znL0lIO+DvMg=
+github.com/BurntSushi/toml v1.5.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
 github.com/PuerkitoBio/goquery v1.12.0 h1:pAcL4g3WRXekcB9AU/y1mbKez2dbY2AajVhtkO8RIBo=
 github.com/PuerkitoBio/goquery v1.12.0/go.mod h1:802ej+gV2y7bbIhOIoPY5sT183ZW0YFofScC4q/hIpQ=
 github.com/andybalholm/cascadia v1.3.3 h1:AG2YHrzJIm4BZ19iwJ/DAua6Btl3IwJX+VI4kktS1LM=

internal/config/config_test.go

@@ -20,6 +20,14 @@ func TestLoadDefaults(t *testing.T) {
 }
 
 func TestLoadFromFile(t *testing.T) {
+	// Clear env vars so we test pure config file values
+	t.Setenv("PORT", "")
+	t.Setenv("HTTP_TIMEOUT", "")
+	t.Setenv("UPSTREAM_SEARXNG_URL", "")
+	t.Setenv("LOCAL_PORTED_ENGINES", "")
+	t.Setenv("BRAVE_API_KEY", "")
+	t.Setenv("BRAVE_ACCESS_TOKEN", "")
+
 	dir := t.TempDir()
 	path := filepath.Join(dir, "config.toml")
 	content := `