Lovable Build — InboxFlow (Inbox Assistant)

PRODUCT
InboxFlow is a demo-first inbox assistant that turns email into an actionable workflow: triage → label → task → done.
This MVP uses a DEMO email dataset (no real inbox integration today). The goal is to prove the workflow before production complexity.

NONNEGOTIABLES
- Inbox loads from seeded demo data immediately (no auth)
- Email rows are clickable → open Email Detail
- Actions persist: archive, important, labels, tasks
- Rules exist and apply on "Sync": if from/subject contains → label/mark important
- End-to-end loop must work: Inbox → Detail → Action → Task/Rule → Sync → Updated state

SCREENS
1) Demo Connect (simple start screen): Title "InboxFlow (Demo Inbox)"; Button "Load Demo Inbox"; one-liner "Prove the workflow before connecting real email."; after load, route to Inbox.
2) Inbox: list emails with sender, subject, snippet, date, isRead, isImportant, labels, archived status; Filters: All / Unread / Important / Labeled / Archived; clicking an email opens Email Detail; Buttons: "Sync", "Rules", "Tasks"; show "Last Sync: timestamp".
3) Email Detail: show full email (sender, subject, date, body); Actions: Mark Read/Unread; Mark Important; Add Label (dropdown + create new label); Archive / Unarchive; "Create Task from Email" (task title defaults to subject); Back button returns to Inbox with updated state.
4) Rules: create rule form (If FROM contains [text] OR SUBJECT contains [text]; Then add label [text] and/or mark important); list rules with enable/disable/delete; rules apply when user presses "Sync".
5) Tasks: task list created from emails; each task has title, linked email, status (open/done); clicking a task opens the linked email detail; mark task done (optional: archive linked email).

DATA MODEL (simple)
Email: id, from, subject, snippet, body, date, isRead, isImportant, labels[], isArchived
Rule: id, isEnabled, fromContains, subjectContains, addLabel, markImportant
Task: id, emailId, title, status(open/done), createdAt

DEMO EMAIL DATASET
Seed 25 demo emails across categories: Sales lead inquiry (3); Customer issue/support (5); Invoice/billing/finance (4); Meeting request/scheduling (4); Newsletter/marketing (5); Hiring/resume (2); Vendor/partnership (2). Each email must have realistic subject + snippet + body text.

SYNC BEHAVIOR
- "Sync" refreshes the inbox list and reapplies rules to all non-archived emails.
- Do NOT wipe user actions; preserve labels/important/read/archive/task states.

ACCEPTANCE TEST MUST PASS
- Load Demo Inbox → Inbox renders 25 emails
- Click an email → detail opens
- Add label + mark important → visible back in Inbox
- Archive an email → it moves to Archived filter
- Create a task from an email → task appears in Tasks
- Create rule (subject contains "Invoice" → label "Finance") → Sync → invoice emails get labeled
- Open a saved task → routes to linked email detail