Shared "Topics to discuss" list (#206)

[aleksejs1]

Closes #206, the last item of #213.

What

Drafts are private until published, so topics one side jots down during the week were invisible to the other until then. The first card on a meeting is now a shared list either side adds to at any time, visible to the other within one live-update poll.

• The list. Only the author edits or deletes a topic; either side ticks it as discussed; archived, it is frozen. Topic text renders inline Markdown. Strings in all 6 locales.
• Storage. Anketa::$topicsBlob/$topicsVersion (SQLite + MySQL migrations), encrypted under the meeting key. PUT /api/anketas/{id}/topics saves through the same conditional UPDATE as the "discussed" ticks. In the detail, live-state and data export.
• Carry-forward. Undiscussed topics move to the next meeting like unchecked outcomes, re-encrypted by the archiving browser. The archive request names the topicsVersion they were built from; if the list has moved on, the archive is refused with the meeting left open and the page retries with the current list.
• Form version 3. New meetings on all four built-in templates drop discuss/managerDiscuss; older meetings keep the blocks and their answers. Company templates keep both ids valid and the editor still offers them; only the new-template prefill leaves them out.
• Demo data. demo-seed.json regenerated for all 6 locales: the "what else" entries are topics now.

Decisions on the issue's open questions

• No comments on topics in this version.
• Topic ticks are independent of the per-block "discussed" ticks (Live-synced question checkboxes: mark discussed topics during a 1:1 meeting #168).

Full reasoning, the client design (TopicsSync, one per loaded meeting) and the accepted limitations are in docs/decisions/2026-10-04-shared-topics-list.md.

Known limitations

• A tab left open across the release archives without carrying topics, and still shows the retired question on new meetings.
• An open topic edit is dropped if the meeting is archived meanwhile.
• AnketaTopics.svelte repeats much of AnketaOutcomes.svelte, and TopicsSync much of DiscussedSync.
• The images in docs/screenshots/ were not regenerated (the script is fixed; they still show the page without the card).
• Translations were written by Claude and are not native-speaker-reviewed.

Verification

• make verify-pr-ready passes: backend 849 tests, PHPStan, CS, PhpMetrics; frontend 932 tests, typecheck, lint, knip, format, duplication, doc links.
• Full Playwright suite (65) against the e2e stack, including two new dual-actor tests: topics shared before publishing, synced both ways, a stale carry-forward refused once then carried, only undiscussed topics in the successor; and a form-version-2 meeting still showing its "What else to discuss" answers. The full suite last ran before two final small changes; the four affected tests were re-run after them.
• Both migrations run up/down/up, the MySQL one on a throwaway MySQL 8.4.
• Seeded demo topics checked by logging in as two demo accounts in a real browser.
• Eight independent code-review rounds; see docs/history.md for what each found.

🤖 Generated with Claude Code