fix(frontend): drop dead resample trigger/resolutions config

config.ResampleConfig stopped emitting the trigger and resolutions fields,
but MetricPlot still read them. resampleResolutions and resampleMinimum
were therefore always null, which made the array-based resolution branch in
the setScale hook unreachable and the timestep !== resampleMinimum guard
always true. Keep only the policy-based branch and derive the zoom trigger
straight from targetPoints.

configs/config-large.json still carried the removed minimum-points, trigger
and resolutions keys, which DisallowUnknownFields now rejects, so starting
against it aborted. Replace them with the current keys and add a test that
loads the file, so the example configs cannot drift out of the schema
unnoticed again.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

internal/config/config_test.go

@@ -41,6 +41,25 @@ func TestInitMinimal(t *testing.T) {
 	}
 }
 
+// config-large.json carried the removed resampling keys (minimum-points,
+// trigger, resolutions), which DisallowUnknownFields rejects.
+func TestInitLarge(t *testing.T) {
+	fp := "../../configs/config-large.json"
+	ccconf.Init(fp)
+	if cfg := ccconf.GetPackageConfig("main"); cfg != nil {
+		Init(cfg)
+	} else {
+		cclog.Abort("Main configuration must be present")
+	}
+
+	if Keys.EnableResampling == nil {
+		t.Fatal("resampling config missing")
+	}
+	if Keys.EnableResampling.DefaultAlgo != "average" {
+		t.Errorf("wrong default algo\ngot: %s \nwant: average", Keys.EnableResampling.DefaultAlgo)
+	}
+}
+
 func TestTargetPointsForPolicy(t *testing.T) {
 	tests := []struct {
 		policy string