[Improve] Group the Users task filter into Users and Automations

[roomote-roomote]

Opened on behalf of Matt Rubens. Follow up by mentioning @openmote, in the web UI, or in Slack.

Related issue

N/A — internal Roomote work from Slack request.

Why this PR exists

• I am a maintainer / this is internal Roomote work

What changed

The Users filter dropdown on /tasks now matches the Environment filter pattern:

• Any User stays at the top
• Users group for human / external initiators
• Automations group for automation initiators (section title only; items stay plain labels like "PR Review")

How it was tested

• Unit: TaskFilters.client.test.tsx covers grouped Users/Automations labels and keeps "Any User"
• pnpm --filter @roomote/web check-types
• Pre-push: pnpm lint:fast, pnpm check-types:fast, pnpm knip
• Manual visual proof on /tasks after dev-login (Automations section omitted when no automation options exist in demo data)

Screenshots

Checklist

• The PR title follows the repo convention: [Fix], [Feat], [Improve], [Refactor], [Docs], or [Chore] followed by a user-facing description
• This PR is small and scoped to one change
• pnpm lint and pnpm check-types pass locally
• I added tests or included a clear manual validation note above
• I removed secrets, tokens, private keys, and customer data from code, logs, and screenshots
• If this change should appear in the changelog, I ran pnpm changeset

[roomote-roomote]

No code issues found. See task

Reviewed the grouped Users/Automations task filter change in TaskFilters.tsx and its test. The grouping via parseCreatorFilterValue correctly routes automation:* values into the Automations section while human and external:* initiators stay under Users, mirroring the existing Environment filter pattern. Section labels render only when their group is non-empty. The added unit test passes.