feat(fleet): tidy the Overview toolbar and shorten tab labels (#1361)

- Move the Add node button into the Overview toolbar beside the
  Grid/Topology toggle so it sits with the view it acts on instead of
  showing on every Fleet tab. It stays admin-only.
- Collapse the node search to an icon button that expands to the full
  input on click and collapses again on blur once the query is empty,
  reclaiming toolbar width. An active query keeps it open.
- Match the sort-direction toggle and the sort dropdown to the outlined
  dark fill of the Filters button for a consistent toolbar row.
- Swap the Check Updates icon to the refresh-with-dot glyph.
- Rename two tabs: Fleet Actions to Actions, Dependencies to Map
  (display labels only; internal keys unchanged).

Update the feature docs to the new tab labels.

docs/features/licensing.mdx

@@ -28,7 +28,7 @@ See [the pricing page](https://sencho.io/pricing) for current pricing.
 - Multi-node management in both Proxy and Pilot Agent modes
 - Fleet View with search, sort, filter, and node-card drill-down
 - Manual and scheduled fleet snapshots (create, browse, restore, delete) and Remote OTA node updates (per-node and **Update all**)
-- Fleet Actions tab (stop stacks fleet-wide by label, bulk-assign labels to many stacks on a node, prune Docker resources fleet-wide; admin role required), plus fleet-wide bulk Sencho restart
+- Actions tab (stop stacks fleet-wide by label, bulk-assign labels to many stacks on a node, prune Docker resources fleet-wide; admin role required), plus fleet-wide bulk Sencho restart
 - Bulk actions on a label (deploy, stop, or restart every stack tagged with it)
 - Atomic deployments with automatic rollback, and one-click rollback to the previous deployment
 - Auto-update policies for stack images and auto-heal policies for failed containers