fix(admin): datetime popover clock, unsaved confirm, inferred list dates

BM UAT on v0.1.1 showed a date-only calendar for datetime fields, a stuck discard dialog, and raw ISO timestamps when columns.yaml omitted type. The picker now edits time in the popover, confirm sits above the calendar, and omitted time.Time / Date / TimeOfDay columns compile as datetime / date / time.

Co-authored-by: Cursor <cursoragent@cursor.com>

modules/cabana/list_schema_test.go

@@ -9,6 +9,7 @@ import (
 	"testing/fstest"
 	"time"
 
+	"git.golem15.com/golem15/summercms/modules/lagoon"
 	"git.golem15.com/golem15/summercms/modules/pact"
 	"git.golem15.com/golem15/summercms/modules/phrasebook"
 	"git.golem15.com/golem15/summercms/modules/towel"
@@ -96,6 +97,55 @@ toolbar:
 	})
 }
 
+func TestListColumnTypeInferred(t *testing.T) {
+	const columns = `columns:
+    name:
+        label: Name
+        searchable: true
+    created_at:
+        label: Created
+    released_on:
+        label: Released
+    opens_at:
+        label: Opens
+    active:
+        label: Active
+        type: switch
+`
+	type row struct {
+		ID         uint             `gorm:"column:id;primaryKey"`
+		Name       string           `gorm:"column:name"`
+		CreatedAt  time.Time        `gorm:"column:created_at"`
+		ReleasedOn lagoon.Date      `gorm:"column:released_on;type:date"`
+		OpensAt    lagoon.TimeOfDay `gorm:"column:opens_at;type:time without time zone"`
+		Active     bool             `gorm:"column:active"`
+	}
+	ctl := filterController{schemaController: schemaController{model: "Widget"}, rec: &row{}}
+	schema, err := CompileList("acme.demo", ctl, listFS(allColumnsConfig, columns))
+	if err != nil {
+		t.Fatal(err)
+	}
+	got := map[string]string{}
+	for _, col := range schema.Columns {
+		got[col.Key] = col.Type
+	}
+	want := map[string]string{
+		"name":        "",
+		"created_at":  "datetime",
+		"released_on": "date",
+		"opens_at":    "time",
+		"active":      "switch",
+	}
+	if len(got) != len(want) {
+		t.Fatalf("columns = %v, want %v", got, want)
+	}
+	for key, typ := range want {
+		if got[key] != typ {
+			t.Fatalf("column %s type = %q, want %q (%v)", key, got[key], typ, got)
+		}
+	}
+}
+
 func TestListSchemaEmpty(t *testing.T) {
 	const config = `list: ~/plugins/acme/demo/models/widget/columns.yaml
 modelClass: Widget