[Bug] Deadline enforcement: missing has_deadline check + API uses wrong timestamp

[realproject7]

Problem

PR #807 introduced deadline enforcement but has two bugs:

Bug 1: has_deadline not checked (critical)

The deadline expiry logic is applied unconditionally to ALL storylines. Storylines created with has_deadline=false (no 7-day deadline) would be incorrectly blocked from creating new plots if their last_plot_time is old.

Affected locations:

• src/components/AddPlotButton.tsx — isDeadlineExpired() doesn't check has_deadline
• src/app/create/page.tsx — isStorylineExpired() doesn't check has_deadline
• src/app/api/index/plot/route.ts — API query selects last_plot_time, sunset but not has_deadline

Bug 2: API uses Date.now() instead of block timestamp (edge case)

The API indexer checks Date.now() > deadline but this runs AFTER the on-chain tx already succeeded. A plot submitted at T-1 minute that the contract accepted could fail indexing if Date.now() has moved past the deadline by the time the API processes it.

Fix: Compare against the block timestamp (already fetched in the route) instead of Date.now().

Solution

1. All three locations must check has_deadline === true before applying deadline logic
2. AddPlotButton needs hasDeadline as a prop
3. isStorylineExpired in create page should check s.has_deadline
4. API route should select has_deadline and skip check when false
5. API should compare block timestamp vs deadline, not Date.now()

Acceptance Criteria

• Storylines with has_deadline=false are never blocked by deadline logic
• AddPlotButton receives and checks hasDeadline prop
• Create page isStorylineExpired checks has_deadline
• API selects and checks has_deadline
• API uses block timestamp instead of Date.now() for deadline comparison

Branch

task/<issue>-deadline-has-deadline-fix