Web client comments describe the code to a stranger (#6222)

Milestone 546 "Bring the repo to the comment standard (rule 32) and
compose defaults (rule 198)", step #6222 "Comment standard sweep: web
client (frontend/)".

Comments, docstrings and template notes across frontend/ now say what
the code does and the non-obvious why as present-tense facts. Issue,
task, note, milestone and family-idea references are gone, along with
narration of what used to happen: the titles index's wiki-link origin
and its once-per-session load (#5165), the card-controls overlap a
phone showed (task 2697), the M7 and M10.9 labels, and the card
unification behind the reminders lens (task 1913). Hazards stay as
facts, among them LEAVE_MS matching the editor's leave duration, the
Android client twin that must not be widened, and keeping leavers in
flow in the multi-column masonry.

62 files, comments only: a comment-stripping diff of every changed file
against HEAD is identical.

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

frontend/public/sw.js

@@ -1,12 +1,7 @@
-// Inkwell service worker — installable shell, deliberately NOT offline-first.
-//
-// This exists so the web app satisfies the PWA install criteria ("Add to Home
-// Screen") and shows a friendly page when a navigation happens with no network.
-// The offline clients are the desktop and Android apps; to stay always-fresh
-// and avoid deploy staleness, this SW does NOT cache the app shell, hashed build
-// assets, or any /api response — everything but the offline fallback goes
-// straight to the network. So an installed copy is the live web app, never an
-// older one (#1919).
+// Inkwell service worker: makes the web app installable and shows a page when a
+// navigation has no network. Deliberately not offline-first (the desktop and Android
+// apps are): it caches only the offline page, so an installed copy is always the live
+// web app.
 const CACHE = "inkwell-shell-v1";
 const OFFLINE_URL = "/offline.html";