Add support for editing Vrbo property headline separately from property name

Problem statement:

• The "Vrbo property name" field in Hospitable only updates the longer ~80-character Vrbo title
• The shorter ~40-character Vrbo headline shown on the live listing page (e.g., "Pet-friendly home with trail access") cannot be edited from the Hospitable dashboard
• This field is not accessible in any Details sub-tab or Channel Connections

Current workaround:

• No workaround currently available — the headline cannot be edited through Hospitable

Impact:

• Hosts cannot customize the shorter headline that appears on their live Vrbo listing
• This limits the ability to optimize listing presentation and guest appeal

Proposed solution:

• Add a separate field in Hospitable for editing the Vrbo property headline (the ~40-character title shown on the live listing)

Unlock:

• Hosts would be able to fully customize both the long title and short headline for their Vrbo listings directly from Hospitable, improving listing presentation and guest appeal