[BALAJI] Vendor activity on PO0201355 (2 updates)
Preheader: Per-PO or per-Bill digest of vendor-side notes/comments emitted after a 30-minute quiet window. Bundles all activity in the window into one email so a vendor editing 8 lines triggers 1 email, not 8.
Add RESTLET_DP_SETTINGS_URL to .env.local to enable test sends through NetSuite.