FN-6197: suppress tab-resume fetch errors in dashboard

Keep cached dashboard data visible while reconnecting after transient tab-resume fetch failures.

- detect likely tab suspension and visibility-resume fetch errors across dashboard data hooks
- suppress transient "Failed to fetch" errors when cached project and node data already exist
- show a "Connecting…" executor status state instead of surfacing raw resume-time fetch errors
- add dashboard tests covering visibility suspension handling and executor reconnect rendering
- add a patch changeset for the published CLI package

Files changed:
 .changeset/tame-tab-resume-fetch.md                |   5 +
 packages/dashboard/app/App.tsx                     |  16 ++-
 .../dashboard/app/components/ExecutorStatusBar.css |  19 ++-
 .../dashboard/app/components/ExecutorStatusBar.tsx |  12 ++
 .../__tests__/ExecutorStatusBar.test.tsx           |  20 ++-
 .../dashboard/app/hooks/__tests__/useNodes.test.ts | 149 ++++++++++++++++++++-
 .../app/hooks/__tests__/useProjects.test.ts        |  72 +++++++++-
 .../hooks/__tests__/visibilitySuspension.test.ts   |  13 ++
 packages/dashboard/app/hooks/useExecutorStats.ts   |  15 ++-
 .../dashboard/app/hooks/useManagedDockerNodes.ts   |  25 +++-
 packages/dashboard/app/hooks/useMeshState.ts       |  25 +++-
 packages/dashboard/app/hooks/useNodes.ts           |  25 +++-
 packages/dashboard/app/hooks/useProjectHealth.ts   |  18 ++-
 packages/dashboard/app/hooks/useProjects.ts        |  27 +++-
 packages/dashboard/app/hooks/useUsageData.ts       |  24 +++-
 .../dashboard/app/hooks/visibilitySuspension.ts    |   4 +
 16 files changed, 435 insertions(+), 34 deletions(-)

Fusion-Task-Id: FN-6197

Fusion-Task-Lineage: 834f56d8-8391-414f-8cbd-7e626c5724d0

packages/dashboard/app/components/ExecutorStatusBar.css

@@ -29,6 +29,7 @@
   background: var(--executor-status-error-bg);
 }
 
+.executor-status-bar--connecting,
 .executor-status-bar--loading {
   background: var(--surface);
 }
@@ -102,6 +103,14 @@
   background: var(--color-error);
 }
 
+.executor-status-bar__indicator--connecting {
+  background: var(--color-warning);
+}
+
+.executor-status-bar__indicator--connecting.executor-status-bar__indicator--active {
+  animation: executor-pulse 1.5s ease-in-out infinite;
+}
+
 /* Numeric count display */
 .executor-status-bar__count {
   font-family: var(--font-mono);
@@ -251,13 +260,21 @@
 }
 
 /* Error message */
-.executor-status-bar__error {
+.executor-status-bar__error,
+.executor-status-bar__connecting {
   display: flex;
   align-items: center;
   gap: 6px;
+}
+
+.executor-status-bar__error {
   color: var(--color-error);
 }
 
+.executor-status-bar__connecting {
+  color: var(--color-warning);
+}
+
 /* Loading message */
 .executor-status-bar__loading-text {
   color: var(--text-muted);