Frontend-only release. Overhauls the stack Logs tab: - Fix the log panel growing down the page (AppShell <main> has no definite height, so the page h-full/flex-1 chain collapsed to auto): the scroll area now uses a fixed h-[65vh] instead of flex-1. - Filter by container (service <select>) plus a free-text search; the line count shows filtered / total. - Dozzle-style per-line severity coloring (error/warn/debug via regex). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>