feat: add TimeSpent to planned tasks

[AdamJ]

Summary

Type of Change

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

Related Issue

Changes Made

Pulling a planned task into an active day now keeps track of the time spent on said task. If a planned task is not completed in a single day, it can now be added to additional days with the same "add to active day" option.

Any amount of time spent on a planned task (when pulled into an active day) automatically adds and updates time so that a user can track how long a task took to complete.

Checklist

Complete all items that apply to your change. Check N/A for items that don't apply.

Documentation

Run sync-docs skill with Claude Code to automatically update relevant files.

• 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

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