[AdamJ]

Summary

Planning initiatives only had a deadline, so every timeline bar started at the initiative's creation date. This adds an optional start date so a bar can cover the full start-to-deadline scope, and pre-fills the deadline pickers with sensible defaults.

Type of Change

• New feature
• Update to existing feature
• Bug fix
• Documentation update
• Other (describe below)

Related Issue

N/A

Changes Made

• InitiativeSheet.tsx: new optional "Start date" field. A deadline before the start date is rejected. An explicit start date replaces the creation-date floor on the deadline, so past work can be logged retroactively. Clearing the field in edit mode unsets it.
• InitiativeSheet.tsx: the deadline pickers open pre-filled. "Specific date" defaults to today's local date and "Quarter" defaults its year to the current year (the quarter is still chosen by the user). Start date stays blank. Edit mode keeps saved values and only falls back to these defaults when switching deadline type.
• InitiativeTimeline.tsx: bars run from startDate (falling back to createdAt) to the deadline. The label reads "Start – Deadline" when a start is set.
• initiativeUtils.ts: resolveInitiativeStart, isDeadlineBeforeStart (local-day comparison, same UTC-midnight care as the existing helpers), and toLocalDateString.
• TimeTrackingContext.tsx: Initiative.startDate?: string.
• Persistence: Supabase service maps start_date, new migration supabase/migrations/20261110_initiative_start_date.sql. SQL backend repository maps start_date, and server/schema.ts adds the column to existing databases on startup. Guest localStorage and SqlApiService pass the full object through, so they needed no change.
• Tests added for the utils, form validation, prefill defaults, submit/clear behavior, timeline label and bar position, Supabase mapping, and localStorage round-trip.
• Docs: CHANGELOG.md, README.md, README-EXT.md, AGENTS.md.

Checklist

Documentation

• Any notable changes added to the README.md
• CHANGELOG.md updated accordingly
• N/A — no README changes

General

• Branch is up to date with main
• No unrelated files included in this PR
• Tested locally by invoking the pnpm test, pnpm lint, and pnpm build

Notes for Reviewers

• Deploy step: run 20261110_initiative_start_date.sql against existing Supabase projects before this ships, otherwise initiative upserts will fail on the unknown start_date column.
• Existing initiatives have no start date and render exactly as before.
• Not tested against a live Supabase project or a live Postgres/MySQL backend; Supabase mapping is covered by unit tests with a mocked client, and the SQL backend column add is untested.
• AGENTS.md lists pnpm check:design-tokens, pnpm lint:markdown, and pnpm check:a11y as pre-commit steps, but none of those scripts exist in package.json, so they were not run.
• The first commit on the branch carries a Co-Authored-By: trailer that the repo's AGENTS.md forbids; removing it needs a history rewrite and force-push.

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