feat: order CSV import with account grouping

[scottcarlton]

Summary

• Add bulk order import from CSV (upload or paste), accessible via "Import" button on the orders page header
• CSV rows are grouped by account name (case-insensitive) — each unique account becomes one order with multiple line items, instead of one order per row
• Products resolved by style number against the org's catalog; unmatched accounts or styles are skipped with per-row reporting
• Grouped preview UI shows account cards with expandable line items, with remove row/group controls before committing
• Toast feedback includes both order count and line count

Test plan

• Log in as brand org, navigate to /orders, confirm "Import" button appears
• Click Import → modal opens with Upload / Paste CSV tabs
• Download CSV template → verify headers: account, style_number, qty, unit_price, color, size, expected_ship_date, notes
• Upload CSV with multiple rows for same account → preview shows grouped under one account header
• Upload CSV with unknown account → rows skipped, toast reports skip count
• Upload CSV with unknown style_number → line skipped, other valid lines for same account still import
• Remove a line from preview → group updates
• Remove entire account group → rows removed
• Click Save Items → toast shows "N orders imported (M lines)"
• Orders list refreshes with new draft orders
• bun run check — 0 errors
• bun run test:run — 575 tests pass (includes 3 new groupOrderRows tests)

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
threadline	Ready	Preview, Comment	May 30, 2026 6:08pm