feat: rework the MCP server clients and sessions tab

[bflad]

Both listings move from ad-hoc markup onto the shared design system Table: searchable, filterable, sortable, and paginated ten rows at a time, under a pair of metric cards summarizing the server's active sessions and registered clients.

The clients table gains an active session count per client, backed by a new required active_session_count field on the UserSessionClient API type and a batched tally query that defines "active" exactly as the sessions listing's active filter does. The count is clickable and drills into that client's sessions, the same as the kebab menu's View sessions action. Drilling in narrows both listings to that client behind a Filtered to X bar with a Clear filter button, so the two tables stay in view without scrolling.

The sessions table shows the subject's avatar and the session creation date, which adds subject_photo_url and user_session_client_id to the UserSession API type. Both come from columns the listing query already selects or joins.

The CIMD and DCR source badges each carry their own color now, so the two registration modes separate at a glance in a long list.

Counts, search, filters, sort, and pagination all operate over the whole result set rather than one page of it, so the tab pulls every cursor page up front, capped at ten pages, and says so when a set is cut short. Section copy is shortened accordingly and the per-row issuer slug is dropped, since a server is provisioned with one session issuer today.

Date dimensions are relative presets rather than the shared daterange filter kind, which reads and writes one set of URL params and so cannot express the three date windows this page needs.

Also fixes sortable headers in the shared Table component losing their uppercase eyebrow styling, because the browser's form control styling drops text-transform on the button inside the header cell. This affects every sortable table in the dashboard.

[changeset-bot]

🦋 Changeset detected

Latest commit: ed5cf06

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
server	Minor
dashboard	Minor

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[cubic-dev-ai]

All reported issues were addressed across 23 files

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[bflad]

Demo

Sessions

1. Paging through 15 sessions ten rows at a time.
2. Searching by subject; the result count follows the search.
3. Sorting by Created.
4. Filtering to sessions expiring within 7 days.

Clients

1. Searching by client name, then filtering to DCR registrations.
2. Sorting by Active sessions, ascending then descending.
3. Clicking a client's active session count to drill into its sessions: both listings narrow to that client behind the Filtered to Cursor bar, and the metric cards keep reporting the server totals.
4. Clear filter restores the full listings.