diff --git a/.planning/PROJECT.md b/.planning/PROJECT.md
index 922b2b5..b3c0edf 100644
--- a/.planning/PROJECT.md
+++ b/.planning/PROJECT.md
@@ -48,7 +48,7 @@ If everything else fails, this must work end-to-end on a single Go binary backed
 - [ ] Auth pages look visually equivalent to the JS app (login/signup)
 - [ ] Dashboard and tablo list match the sidebar + project-card layout from the JS app
 - [ ] Tablo detail (tasks, etapes, files) matches the JS app's visual treatment
-- [ ] Chat and planning views have consistent, polished styling
+- [x] Chat and planning views have consistent, polished styling — Phase 17
 
 ### Out of Scope
 
@@ -127,4 +127,4 @@ This document evolves at phase transitions and milestone boundaries.
 - **Milestone v2.0 shipped: Collaboration, planning, and social sign-in** — Shipped 2026-05-16. Delivered Google sign-in, etapes, events, individual planning, and native SSE-backed tablo discussions. Closed with 7 acknowledged deferred artifact items; see `.planning/milestones/v2.0-MILESTONE-AUDIT.md`.
 
 ---
-*Last updated: 2026-05-16 — Phase 16 complete (tablo detail restyled with design system components)*
+*Last updated: 2026-05-17 — Phase 17 complete (discussion view and planning page restyled with design system components; IsOwn bubble alignment, day separators, HTMX tab fix, discussion max-height with auto-scroll)*