**Requirements:**
[] Change default text (2 versions):
[] With TemplateData: Description comes from TemplateData. Help text: "All parameters are optional unless labeled as required. For help filling in the template, find additional information on its page."
[] Without TemplateData: description added automatically (grayed out and italic): "The “TEMPLATENAME” template doesn't yet have a description.". Help text: "For help filling in the template, find additional information on its page."
[] For both - "its page" is a link to the template's page.
[] Header matches sticky behavior from TemplateWizard, always stays visible while sidebar and main form scroll independently.
**Mocks**
Insert template: {F32188494}
Insert template (with sidebar): {F32188484}
Insert template, no TemplateData: Grayed out text - Base20 #54595D {F32190909}
Edit template ("X" to close in upper left, title change): {F32188492}
Specs: Background color - Base90 #F8F9FA {F32188520}