[FR] the ability to share a page with protection

### Description

share a calander or project with new format is required so peeps can share it easily into social media or email or pc. add a sign in password or set protection on some plan help safty and also you can add encrypted web address to share plans with others in cloud version

### Impact

all users

### Additional Context

_No response_

The issue names no files, tests, or entry points. First clarify whether the scope includes sharing pages, calendars, and projects, plus passwords, encrypted links, social or email sharing, and cloud-only behavior; define the supported plans and acceptance criteria before locating implementation areas.

Written by the indexing model from the issue text.