Notes tab: shared and private notes and checklists; icon-only menu rail on short windows

- notes.js and the Notes tab: private, family or chosen-people sharing; checklist items change one at a time (no overwrites), with who ticked them; open lists refresh live; stale text edits are refused
- Pin, colour, archive, search, filters, ready-made lists, Share to Chat, send open items to Tasks
- The narrow menu rail shows icons only (names on hover) when the window is too short for labels
- Roadmap and README updated

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

docs/v2-roadmap.md

@@ -43,7 +43,7 @@ Not planned: voice and video calls, stories, usernames and phone-number lookup,
 
 ## 2. Family core
 - [ ] **Family Home (M):** one shared start page: who is around, today's family calendar, shared shopping list and chores, what everyone is listening to or reading
-- [ ] **Shared lists and notes (M):** a real Notes and Lists tab the whole family edits (grocery, packing, gift ideas, house to-dos)
+- [x] **Shared lists and notes (M): done (notes.js, the Notes tab):** a real Notes and Lists tab the whole family edits (grocery, packing, gift ideas, house to-dos)
 - [ ] **Chores and routines (M):** recurring chores per person, check-offs, optional points and a weekly summary; kids see their own
 - [ ] **Family calendar (M):** a colour per person, a shared week view, birthdays from Contacts, event invitations inside the family
 - [ ] **Meal planning (M):** a weekly plan from Recipes that builds the shopping list (and can flag what is already in the pantry)