docs(6208): the remaining frontend comments drop milestone, step and rule citations

Components, stores, api clients, router, types and shared CSS now state what
each piece is and why, without the milestone that introduced it. diff.ts
names its consumers instead of the copy history; stores/notes and tasks state
their current scope instead of the cleanup that set it; theme.css states the
token practice instead of the sweep that established it.

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

frontend/src/components/rules/RuleEditorSlideOver.vue

@@ -27,7 +27,7 @@ const whenToApply = ref("");
 // session may quietly rewrite.
 const kind = ref<RuleKind>("rule");
 const systemIds = ref<number[]>([]);
-// The moments this rule is mounted on (milestone 458). Catalog moments are
+// The moments this rule is mounted on. Catalog moments are
 // ticked; a named procedure's moment (`skill.<name>`) is typed, since its
 // name is the procedure's own and no list here could know it.
 const ruleMoments = ref<string[]>([]);
@@ -46,7 +46,7 @@ const expiresWhen = ref("");
 
 const relations = computed(() => store.currentRule?.relations ?? []);
 
-// The lessons that point at this rule (milestone 440): confirmed instances
+// The lessons that point at this rule: confirmed instances
 // first, then suggestions waiting on a judgment. A rejected lesson does not
 // point at the rule, so it is not listed here — it stays readable on the
 // lesson, where the judgment was made.
@@ -509,7 +509,7 @@ legend { padding: 0 0.35rem; font-size: 0.8rem; color: var(--fs-text-tertiary);
 .area-opt { display: flex; align-items: flex-start; gap: 0.5rem; margin-bottom: 0.4rem; font-size: 0.88rem; }
 .area-opt input { width: auto; margin-top: 0.2rem; accent-color: var(--fs-accent); }
 .trigger-missing textarea { border-color: var(--fs-warning); }
-/* The moment picker (milestone 458): the name is what a session reads in a
+/* The moment picker: the name is what a session reads in a
    delivered line, so it is shown as written; the meaning is the gloss. */
 .moments { margin-bottom: 1rem; }
 .moments .intro { margin-top: 0; margin-bottom: var(--fs-space-3); }