refactor(notes): decompose Notes into feature-owned modules (#6713)

* refactor(notes): decompose Notes into feature-owned modules

* fix(notes): avoid HTML interpolation in reminder picker

* docs(notes): drop checkpoint archives, session logs and publication drafts

The N0-N6 tarballs and raw pytest/node logs are not read by any script or
test, and the logs carry absolute home-directory paths. Once squashed into
dev they would stay in history for good. notes-pr.md and notes-issue.md
were the drafts used to open #6712 and #6713, not documentation.

notes-validation.md keeps the counts, the checkpoint hashes and
implementation.sha256 as the record; local interpreter paths and the local
Docker image name are replaced with portable placeholders.

* fix(notes): keep the state store raw and stop masonry re-observing after close

- state: writes built from views (filter, spread, splice) stored nested
  read-only views in the store, so structuredClone on a stored note threw
  DataCloneError. Store writes now unwrap nested views.
- layout: a save that resolves after closePanel re-renders the leaving pane
  and re-created the masonry ResizeObserver that teardown had disposed.
  Skip creating it once Notes is closed.
- index.js: drop 30 imported or declared names that were never used and
  group the imports at the top. Import order is unchanged.
- Revert unrelated punctuation edits in .gitattributes and keep the header
  comment and docstring first in compare/vote.js and
  test_notes_dom_xss_helpers.py.

Both fixes have a node test that fails on the previous head.

* test(notes): make script rejection assertion case-insensitive

Address CodeQL js/bad-tag-filter alert #1150 in test-only assertion and refresh Notes evidence manifest checksum.

---------

Co-authored-by: Léo <leograndcontact@gmail.com>

docs/frontend-architecture/notes-roadmap.md

@@ -1,15 +1,20 @@
 # Notes reference decomposition roadmap
 
-Status: planning only. F1 changes no Notes implementation. Begin after the
-foundation has been reviewed and integrated into official `upstream/dev`.
-The reference program ends after Notes integration and the completed H handoff.
+Status: N0 through N6 implemented as an unpublished Notes review diff after F1
+merged in PR #6701. Actual decisions, interfaces, module ownership, checkpoint
+receipts and execution limits are in the [case study](notes-case-study.md) and
+[validation report](notes-validation.md). The proposal below retains the original
+responsibility map for comparison. Notes integration and the recipient's independent
+H reproduction remain pending.
 F1 remains an entirely separate foundation-only PR. The complete Notes
 decomposition, regression tests, compatibility validation and final reference
 case study belong to one comprehensive draft PR targeting official `dev`.
 
 ## Verified current responsibility and compatibility map
 
-Baseline: `8feb50e89468235cd3e0986da80edbd3acaf2c40`.
+Historical assessment baseline: `8feb50e89468235cd3e0986da80edbd3acaf2c40`.
+The implementation starts from merged F1 at
+`1cc56cb9d78f3e2399d1d61155b71d771a17b85b`.
 The module is `static/js/notes.js`, about 5,470 lines, with browser identity
 `/static/js/notes.js?v=20260911notesselectioncancel1`. Preserve that identity across
 the app import, HTML, SW and lazy consumers until a separately reviewed migration