fix(FN-2204): restore tokenized styling in agents views

- Replace inline agent state badge and card colors with state-specific CSS classes across list, board, tree, and org chart views
- Add reusable AgentEmptyState with create-agent CTA and wire it into all empty agent view modes
- Polish agents controls and metrics presentation in AgentsView/AgentMetricsBar with corresponding stylesheet token updates
- Extend dashboard tests for agent CSS classes, metrics bar behavior, list view rendering, and mobile view coverage
- Add a patch changeset for @gsxdsm/fusion describing the agent view UX improvements

.changeset/config.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@3.1.1/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}