feat(comments): интеграция редизайна панели комментариев (обе карточки) (#561)

Port the NewDesign/CommentsPanel prototype onto the entire live comment panel,
both card types (agent suggested-edit + human/agent thread) on the new visual,
reusing existing mutations/gates/editor/menu/resolve/anchor-nav (not forked),
zero backend changes. New: agent-edit-card, severity.ts, group-agent-runs.ts.
Delete only the CommentsPanel prototype (TimeWorkedModal/PageHistoryModal belong
to #566/#568 and are deleted by their own PRs).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/client/src/features/comment/utils/severity.ts

@@ -0,0 +1,44 @@
+// Severity of an agent suggested-edit, parsed CLIENT-SIDE from the importance
+// tag the editorial role prompts emit at the head of the comment body
+// (`[Критично]` / `[Существенно]` / `[Незначительно]`, or their English
+// equivalents). It is a DISPLAY-ONLY signal: it drives the coloured dot on the
+// edit card and the "M major" counter in a run header. It never gates an action.
+//
+// `unknown` is a first-class value, NOT a synonym for `minor`: any bracketed
+// text that is not in the exact dictionary — a Fact-checker verdict
+// (`[Неверно]`, `[Не проверено]`, `[Непроверяемо]`, `[Это мнение]`), a typo
+// (`[Существенное]`), or the absence of a tag — resolves to `unknown` and draws
+// a neutral dot. Passing an unrecognised tag off as `minor` would mis-label it.
+export type Severity = "critical" | "major" | "minor" | "unknown";
+
+// EXACT (case-insensitive) dictionary. Only these tokens map to a real severity;
+// everything else falls through to `unknown` on purpose.
+const SEVERITY_TAGS: Record<string, Severity> = {
+  критично: "critical",
+  существенно: "major",
+  незначительно: "minor",
+  critical: "critical",
+  major: "major",
+  minor: "minor",
+};
+
+// Parse the first RECOGNISED importance tag out of the flattened comment text
+// (use `commentContentToText` to obtain it). Scans every `[...]` token so a tag
+// that trails a verdict still counts; the first exact-dictionary hit wins. When
+// no token matches the dictionary the result is `unknown`. PURE — no React/DOM.
+export function parseSeverity(text: string): Severity {
+  if (!text) return "unknown";
+  const matches = text.matchAll(/\[([^\]]+)\]/g);
+  for (const m of matches) {
+    const tag = m[1].trim().toLowerCase();
+    const sev = SEVERITY_TAGS[tag];
+    if (sev) return sev;
+  }
+  return "unknown";
+}
+
+// Whether a severity counts toward the "M major" tally in a run header: only the
+// genuinely significant ones (major + critical). `minor` and `unknown` do not.
+export function isSignificant(severity: Severity): boolean {
+  return severity === "major" || severity === "critical";
+}