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/ui.ts

@@ -53,7 +53,7 @@ export const useUiStore = defineStore("ui", () => {
     run?.();
   }
 
-  // The note whose Share dialog is open (#5174), or null. One dialog for the app,
+  // The note whose Share dialog is open, or null. One dialog for the app,
   // mounted by the shell, so the card and the editor open the same one.
   const shareNoteId = ref<string | null>(null);
   function openShare(id: string) {