apps/web/src/components/Sidebar.drag.test.ts   |  60 ++++++++++
 apps/web/src/components/Sidebar.drag.ts        |  19 +++-
 apps/web/src/components/Sidebar.logic.test.ts  |  22 ++++
 apps/web/src/components/Sidebar.logic.ts       |  17 +++
 apps/web/src/components/Sidebar.motion.test.ts |  37 +++++++
 apps/web/src/components/Sidebar.motion.ts      |  58 +++++++---
 apps/web/src/components/Sidebar.tsx            | 188 +++++++++++++++++++++-----------
 docs/user/thread-sidebar.md                    |  13 ++-
 8 files changed, 326 insertions(+), 88 deletions(-)