feat(conference): add edition phases and delivery timeline

[Elvis020]

Summary

Makes the Annual Conference workspace phase-first: editions own dated delivery phases, tasks can be planned into those phases, and Work Plan and Timeline now answer whether the active phase is on track. The same update tightens volunteer access and redesigns People & Access around safer, owner-controlled membership management.

User-facing changes

Phase-first planning

• Adds edition-scoped phases, with fixed Phase 1 and Phase 2 windows for 2026 and any number of ordered phases for later editions.
• Lets the planning owner create future editions and explicitly select or inherit the next planning owner.
• Adds optional phase assignment and target dates to tasks while preventing target dates from exceeding the selected phase end.
• Seeds the agreed 2026 Phase 1 responsibilities, including the new Volunteer recruitment task.
• Keeps Work Plan and Timeline focused on the active phase by default, while allowing users to switch phases, view unclassified tasks, or inspect the full conference.

Work Plan and Timeline

• Consolidates phase context, status totals, completion, owner filtering, and filter clearing into one compact Work Plan control panel.
• Uses bounded pagination for the task ledger so the work plan does not grow with the task count.
• Refocuses Timeline on the selected phase summary, delivery runway, and a compact planning-gap table with direct task editing.
• Keeps countdowns and task signals current and prevents navigation width shifts between pages with different overflow.

Volunteer access and task authorization

• Adds a Volunteer access level that opens directly into assigned Annual Conference work without organizer-wide navigation.
• Shows volunteers only tasks where they are accountable or collaborating and removes organizer-only internal notes.
• Allows volunteers to update only assigned-task status.
• Allows full task edits only for the edition planning owner, accountable owner, or collaborators; the planning owner retains conference-wide task control.

People & Access

• Rebuilds the page as a compact, paginated member directory with Navii avatars and a focused invitation panel.
• Requires display names and hides member emails by default; only Owners can reveal them.
• Gives only Owners a slim inline control for switching active members between Organizer and Volunteer.
• Enforces role changes server-side, records them in the audit log, and immediately revokes the affected member's active sessions.

Interface refinements

• Simplifies annual workspace navigation, task forms, date selection, collaborator selection, volunteer applications, typography, loading stability, and scrollbar presentation.
• Replaces heavy black status treatments with restrained app-native states and keeps dropdowns within the shared component system.

Implementation notes

• Adds 20260802120000_annual_conference_phases.sql for edition phases and task schedule fields.
• Adds 20260803110000_annual_conference_phase_1_assignments.sql for the agreed Phase 1 responsibilities.
• Validates phase overlap, edition ownership, deletion safety, and task schedule boundaries in the API and database layers.
• Keeps phase assignment and target dates nullable so existing work can be classified deliberately.
• Applies owner-only role-change authorization in both API routing policy and the endpoint itself.

Verification

• pnpm test -- --reporter=dot — 71 files, 304 tests passed
• pnpm build
• git diff --check
• Branch contains exactly one commit over main

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	events-management	19326b5	Commit Preview URL Branch Preview URL	Aug 03 2026, 01:16 PM