feat(diagnostics): the issue composer — draft, review, screenshots, zip export (E16 S3)

After Stop (or at the cap, or from Settings → Diagnosztika's past sessions)
one dialog drafts the issue: title, description, the steps drafted from the
session's markers and page changes (a marker without a label is named by its
time), the environment (version, browser, system, window, language). Beside
it, what goes with it: the browser and server logs — each reviewable line by
line, an unticked line is not sent — and the screenshots, removable, with
paste / drop / pick to add more.

- it saves as it goes (debug_sessions.draft, migration 0090): the rendered
  markdown in the user's language, the excluded rows, and its own fields to
  reopen as it was; a sent session is read-only
- the zip export (issue.md, client.log, server.log, screenshots) is built
  from the saved draft by app/issues/bundle.py — the one definition the Gitea
  delivery (S4) will share; .log, not .jsonl, which Gitea refuses
- the log line's level tags and clock move to components/logLineParts so the
  review list draws a level the way both log viewers do

frontend/src/components/useDebugRecording.ts

@@ -8,6 +8,7 @@ import { closeRecorderStart, nextStep, openComposer } from "../lib/debugRecorder
 import { flushNow, liveSession } from "../lib/diagnostics";
 import { log } from "../lib/log";
 import { notify } from "../lib/notifications";
+import { qk } from "../lib/queryKeys";
 import { updateMeCache, useMe } from "../lib/useMe";
 
 /** The debug recording's actions (E16), shared by everything that drives it: the pill, Settings →
@@ -18,8 +19,10 @@ export function useDebugRecording() {
   const qc = useQueryClient();
   const me = useMe();
   const session = liveSession(me?.debug_session);
-  const setSession = (next: DebugSession | null) =>
+  const setSession = (next: DebugSession | null) => {
     updateMeCache(qc, (prev) => ({ ...prev, debug_session: next }));
+    void qc.invalidateQueries({ queryKey: qk.debugSessions() });
+  };
 
   const start = useMutation({
     mutationFn: (level: DebugSessionLevel) => api.startDebugSession(level),