fix: restore envelope number in export, remove accents from branches

perf: fast Excel export — dedicated endpoint + fixed column widths

fix: hide internal AI error details from user-facing responses

fix: respect AI_PRIMARY_PROVIDER config for pool slot ordering

Preserve branches and AI settings on data reset

Replace local CSV with live Google Sheets fetch for envelope data

Add envelope number column with contact lookup, clean summary cards

Broaden Gmail query, clear caches on reset, improve scan logging

Wire Settings page to real data with working buttons

Fix OAuth on reverse proxy (HuggingFace): trust proxy, secure cookies, error display

fix: use x-forwarded-proto for OAuth redirect URI behind reverse proxy

feat: add Email Senders page, replace Reports with Coming Soon, remove AI references

fix: use dynamic redirect URI for Google OAuth in production

feat: add Excel export, filters, search, match accuracy, journal page, and email viewer improvements

Initial commit — ICC Interac Manager full-stack app