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/src/stores/reminders.ts

@@ -6,14 +6,14 @@ import router from "../router";
 import { useUiStore } from "./ui";
 import type { Note } from "./notes";
 
-// Reminder delivery. In a browser it is foreground only — NO Web Push / service
-// worker (per operator): while the tab is open, poll for due reminders and surface
-// each once as a toast (and, if the user opted in, a page-context OS notification).
+// Reminder delivery. In a browser it is foreground only, with no Web Push or service
+// worker: while the tab is open, poll for due reminders and surface each once as a
+// toast (and, if the user opted in, a page-context OS notification).
 //
-// The desktop doesn't poll here. Its Rust worker reads the local store, decides
-// what is due, raises the system notification itself when the window isn't in
-// front, and tells this page so it can show the toast (#5171). The page's
-// `Notification` went nowhere in WebKitGTK, and its timer stopped with the window.
+// The desktop doesn't poll here. Its Rust worker reads the local store, decides what
+// is due, raises the system notification itself when the window isn't in front, and
+// tells this page so it can show the toast. In WebKitGTK the page's `Notification`
+// goes nowhere and its timer stops with the window.
 const POLL_MS = 45_000;
 const RECENT_MS = 15 * 60 * 1000; // on first load, only announce reminders due this recently