PR #16282 - onyx-dot-app/onyx

Description

These are fixes to the admin Agents table (AgentsTable), plus a new opt-in column option in @opal/Table.

1. Text overflow. Long names and descriptions wrapped past the fixed row height and overlapped the next row.

The Name and Description cells now use @opal/OverflowText in place of the legacy refresh-components Text. The text is clamped to 1 line. When the text is cut, hover it to see the full text in a tooltip.
The Content cells now clamp to 1 line. Created By sets titleMaxLines={1}. Access sets titleMaxLines={1} and descriptionMaxLines={1}.
@opal/Table data columns get a new option, truncate?: boolean. When it is set, TableCell adds w-0 min-w-full to .tbl-cell-inner. Under table-layout: auto, the content then cannot widen the column, so long content truncates. Before this change, the Agents table grew to 2844px inside an 840px container. All Agents data columns set truncate: true. The option is off by default, so other tables do not change. For example, the Users GroupsCell measures its own width and needs the old behavior.

2. Random reshuffle after a drag-reorder. The causes:

GET /api/admin/persona (get_persona_snapshots_for_user) has no ORDER BY, so the refetch after a save came back in arbitrary DB order.
handleReorder sent only the moved range, as indexes into the visible list. Other agents kept null or stale priorities, which collided with the new values.
The row snapped back until the refetch finished.

The fix:

The table sorts agents client-side the way the paginated endpoint does: display_priority ascending with nulls last, then |id|.
buildDisplayPriorityMap merges the reordered visible IDs back into the full agent list. It then sends a priority for every agent whose position changed.
The new priorities go into the SWR cache before the PATCH.
@opal/Table now passes the query-filtered rows to useDraggableRows, not all items. A drag while a search is active no longer shifts hidden rows.

bun run types:check, oxlint, oxfmt and the @opal/Table jest tests pass.
I tested in the browser on a local stack with 8 agents; see the comment below. The checks were: no horizontal overflow at 840px and 1600px, ellipsis plus hover tooltip on long cells, and normal, far-below and search-filtered drags. Each order persisted across reload and matched the DB priorities.

Fixes two bugs in the admin Agents table: long text no longer overlaps the next row, and rows stay put after a drag-reorder.

Data columns now accept an opt-in truncate flag; truncated columns never widen the column, clamp content to one line, and show the full value in a hover tooltip.
The Name, Description, Created By, and Access cells clamp this way, using OverflowText or one-line Content with max-line limits.
Drag-reorder operates on query-visible rows only, so hidden rows keep their positions.
On drop, the full agent list is renumbered from the new visible order and the priorities are written to the SWR cache before the PATCH, so rows don't snap back while saving; nothing is saved when no priority changed, and a failed save refreshes the table and shows an error.
The table sorts agents client-side to match the server's order (display_priority ascending with nulls last, then |id|).

New Features
- Added text truncation for long agent names, descriptions, owners, and access details in tables.
- Improved agent reordering, including consistent sorting and reliable updates when filtered.
Bug Fixes
- Preserved correct row positions during drag-and-drop when table filters are active.
Documentation
- Updated table documentation to describe the new truncation option.