Make a TaskDial day publicly shareable

[dajbelshaw]

Description

Allow users to share a read-only public view of their day's task schedule via a unique URL.

Context

From user testing with Stephen Lockyer (2026-03-23). Related to #56 (Public REST API) — this could be built on top of that infrastructure or implemented independently as a simpler share link.

Possible approach

• User generates a shareable link for their current day
• Link opens a stripped-down, read-only view (no editing, no auth required)
• User controls what is shared (could be limited to task names + times, no tags/private data)
• Link can be revoked

Considerations

• E2EE: shared view would need to decrypt data server-side or use a key embedded in the URL fragment
• Privacy: opt-in only, clearly communicated