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/i18n/locales/en/recorder.json

@@ -43,5 +43,77 @@
     "start": "Start a debug recording",
     "step": "Mark a step in the recording",
     "stop": "Stop the debug recording"
+  },
+  "composer": {
+    "title": "Bug report",
+    "meta": "{{start}} · {{minutes}} min · {{level}}",
+    "fieldTitle": "Title",
+    "titlePlaceholder": "What went wrong?",
+    "description": "Description",
+    "descriptionPlaceholder": "What did you expect, and what happened instead?",
+    "steps": "Steps — from your markers and page changes, editable",
+    "stepKind": {
+      "marker": "marker",
+      "nav": "page",
+      "manual": "added"
+    },
+    "stepLabel": "Step {{n}}",
+    "stepPlaceholder": "What did you do?",
+    "withShot": "image",
+    "addStep": "Add a step",
+    "removeStep": "Remove step {{n}}",
+    "environment": "Environment — automatic",
+    "attachments": "Attachments — what is sent, each one removable",
+    "clientLog": "Browser log",
+    "serverLog": "Server log",
+    "lines_one": "{{count}} line",
+    "lines_other": "{{count}} lines",
+    "linesKept": "{{kept}} of {{total}} lines",
+    "review": "Review",
+    "reviewTitle": "{{name}} — review",
+    "reviewHint": "An unticked line is not sent.",
+    "reviewDone": "Done",
+    "keepRow": "Keep line: {{event}} {{msg}}",
+    "screenshot": "Screenshot {{n}}",
+    "removeShot": "Remove screenshot {{n}}",
+    "drop": "Paste an image with Ctrl+V, drop it here, or",
+    "pick": "choose a file",
+    "close": "Close",
+    "export": "Download as zip",
+    "saving": "Saving…",
+    "saved": "Draft saved",
+    "saveFailed": "Couldn't save the draft",
+    "loadFailed": "Couldn't load the session",
+    "truncated": "The logs carry the first {{kept}} of {{total}} lines.",
+    "sent": "Sent as an issue.",
+    "openIssue": "Open the issue",
+    "env": {
+      "version": "Version",
+      "browser": "Browser",
+      "os": "System",
+      "window": "Window",
+      "language": "Language"
+    }
+  },
+  "issue": {
+    "steps": "Steps",
+    "environment": "Environment",
+    "screenshot": "screenshot",
+    "attachments": "Attachments",
+    "clientLog_one": "{{count}} line from the browser",
+    "clientLog_other": "{{count}} lines from the browser",
+    "serverLog_one": "{{count}} line from the server",
+    "serverLog_other": "{{count}} lines from the server",
+    "screenshots_one": "{{count}} screenshot",
+    "screenshots_other": "{{count}} screenshots"
+  },
+  "history": {
+    "title": "Past sessions",
+    "empty": "No session recorded yet.",
+    "open": "Open",
+    "sent": "Sent",
+    "draft": "Draft",
+    "unwritten": "Not written yet",
+    "failed": "Couldn't load the sessions"
   }
 }