Dynamic AI Names, Image Pipeline & Lazy Tool Loading

AI coworkers show their actual names everywhere, images are compressed automatically, and integration tools load on demand to save context.

Features

Format-preserving image compression with WebP/AVIF and automatic thumbnail generation
Customer success notifications via Telegram for the signup funnel
Backfill script for compressing existing images

Improvements

Dynamic AI coworker names replace all hardcoded "Sammy" references across frontend and backend
Lazy integration tool loading prevents AI context exhaustion
Mobile onboarding aligned with web's streamlined flow

Bug Fixes

Avatar image flash in workspace switcher and chat messages
Removed 8 unused onboarding step components and dead code

AI coworkers now display their actual configured names everywhere — chat headers, DM tabs, sidebar, and page editing banners. The image upload pipeline got a major upgrade with automatic compression and thumbnail generation. Integration tools now load lazily to prevent context exhaustion during AI conversations.