feat(tasks,epics): blocked-task warning + epic dates/owner/priority/progress

[parth0025]

Summary

Closes the two gaps surfaced in the Relations & Epics feature review. Tracked as AHE-3770 and AHE-3771 in the v14.5.0 - Polish: Relations & Epics sprint.

1 · Blocked-task warning (AHE-3770)

A task that is blocked_by one or more still-open tasks now shows a "⚠ Blocked by N open task(s)" banner in its Linked Tasks panel — making AlianHub's blocked-task alert real.

• Backend (additive — the central status-write path is untouched): pure selectOpenBlockers + isClosedStatusType (relationRules.js), getOpenBlockers (relations.js), new openBlockers action on POST /api/v2/tasks/relations.
• Frontend (LinkedTasks.vue): banner reuses the existing list response (which already carries each blocker's statusType). A blocker counts only while open (statusType !== 'close') and not deleted, so the warning clears automatically when the blocker closes.

2 · Epics upgrade (AHE-3771)

Turns the thin v1 into a usable progress layer.

• Schema (epics): startDate, dueDate, ownerUserId, priority.
• Rules: EPIC_STATUSES adds in_progress; EPIC_PRIORITIES; parseEpicDates (validates + enforces start ≤ due); validateEpicInput validates priority.
• Controller: create + update accept/persist + validate the new fields.
• Frontend (EpicsPanel.vue): priority badge, owner, dates, a "% · done/total" label, and an inline status select — on top of the existing progress bar.

Tests

• +16 unit assertions (selectOpenBlockers/isClosedStatusType, parseEpicDates, priority/status). Full suite: 225 pass.
• Manual test-cases: .claude/test-cases/BlockedTaskWarning.md, .claude/test-cases/EpicEnhancements.md.

Notes

• No new dependencies. Restart the backend to pick up the schema/route changes.
• A dedicated epic-grouped project view (in the +View switcher) is a noted follow-up; this delivers the progress layer in the Epics panel.

🤖 Generated with Claude Code

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