Add read-first task details with an explicit edit action #107

Work

Render task description using #74's shared renderer and show number, status, ownership and subtasks as readable detail content. Move editable fields behind Edit, using the existing save/version services. Preserve deliberate quick actions where appropriate; opening the view must not mutate state.

Acceptance

• Task cards and shared links open a readable task.
• Authorized Edit opens the current data; Save/Cancel return correctly.
• Unauthorized direct edit requests fail server-side.
• Compact subtask text, links and future blocker/related sections remain usable.

Dependencies

#103 navigation contract and #84; coordinate implementation to avoid duplicate forms.