Extend /info to accept an optional time parameter

[VarunGitGood]

Why

The /info slash command currently renders a fixed 5-hour project overview (events, clusters, services, suggested actions) anchored to now. There is no way for the user to ask the same question for an arbitrary window — e.g. what did this project look like at 03:00 last night? or what happened in the last 24h? They have to fall back to chat or Deep Research for a question the overview endpoint already supports.

Scope (in)

• Slash command accepts an optional time argument: /info 1h, /info 24h, /info yesterday, /info 2026-06-13T03:00.
• Argument is parsed in the UI (or passed through verbatim) and forwarded as the window= query string to the existing GET /projects/{id}/overview endpoint, which already accepts arbitrary windows via parse_window.
• ProjectOverview already handles the response shape; no React tree changes beyond reading the new arg.
• Update CommandPicker.tsx description to reflect the new arg (e.g. /info [window] — show project overview, optional window like 1h, 24h).
• Bare /info (no arg) keeps current behaviour.

Scope (out)

• A separate /timeline command — explicitly rejected; this is just /info with a window.
• Service filtering in the slash command — pursue separately if needed (the overview endpoint already supports it).

Acceptance

• /info 1h renders the overview for the last hour.
• /info 24h renders the overview for the last day.
• /info (no arg) renders the existing default.
• Invalid argument shows an inline error message, does not crash the chat surface.

Files

• web/components/chat/CommandPicker.tsx — update description.
• web/app/page.tsx — parse the arg from command string and pass through.
• web/components/projects/ProjectOverview.tsx — accept optional window prop, forward to API call.
• web/lib/api.ts — projects.overview(projectId, window?).
• repi/api/projects.py — no change (endpoint already accepts window).