Universe dashboard gets a "Recent mentions" section listing every
topic_message from the last 7 days that references the viewer via
`@<displayName>` (per-mesh — a user can carry different display
names in different meshes). One union'd OR query, capped at 20.
Each mention card links straight into the topic chat at the right
mesh. Snippet is the first 240 chars of the decoded ciphertext with
@-tokens highlighted in clay, matching the in-chat renderer.
GET /v1/notifications mirrors the same scan for api-key-authed
clients (CLI, bots) — accepts ?since=<ISO> for incremental polling.
Both paths use Postgres regex on the decoded base64 plaintext;
when per-topic encryption lands in v0.3.0 they'll move to a
notification table populated at write time.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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