Logo banner layout rework, Proton Mail provider, ProviderWizard sizing improvements

Agent-Logs-Url: https://github.com/christianlouis/InboxConverge/sessions/8dc8f341-02b2-4449-8a88-a2124033c31a

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

docs/TODO.md

@@ -5,7 +5,8 @@ Comprehensive task breakdown for repository improvements and production readines
 ## ✅ Recently Completed
 
 - [x] **Pull Now**: Added "Pull Now" button on Accounts page that immediately queues a `process_mail_account` Celery task via `POST /mail-accounts/{id}/pull-now`. Button shows spinner while in flight and is disabled for inactive accounts.
-- [x] **Provider logos**: Provider SVG logos (Gmail, GMX, WEB.DE, Outlook, Yahoo, AOL, T-Online, IONOS, Freenet, Posteo, iCloud) now displayed on the Accounts page next to each account name.
+- [x] **Provider logos rework**: Logos now displayed as full-width banner strips at the top of each account card using `next/image fill + object-contain`. Handles all aspect ratios (1:1 square to 6:1 wordmark) without distortion. Proton Mail added.
+- [x] **Proton Mail provider**: Added Proton Mail preset in backend and ProviderWizard frontend. Domains: proton.me, protonmail.com, protonmail.ch, pm.me. Auto-detect and IMAP/POP3 Bridge settings included.
 - [x] Redesigned user-facing Logs page to mailbox-centric "Mailbox Activity" view: shows last check status per account + only successful pulls, suppressing noise from empty polling cycles.
 - [x] Added `has_emails` filter to `GET /processing-runs` and `GET /mail-accounts/{id}/processing-runs` API endpoints.
 - [x] Rename entire project to **InboxConverge**: all user-visible strings, Docker container/image names, DB defaults, monitoring, and docs updated.