Adds a "Hermes Dashboard" chip to the Settings > Appearance "Sidebar tabs"
grid, bidirectionally synced with the existing dashboard-mode dropdown
(never/always/auto). Chip off -> dropdown "never"; chip on -> restore last
non-never mode; dropdown change -> chip re-render.
The chip is a proxy for the dashboard config via saveDashboardSettings ->
POST /api/dashboard/config; it NEVER mutates hidden_tabs/tab_order (separate
toggle fn from _toggleTabVisibilityChip). loadDashboardSettings guards a stale
config GET from clobbering a newer save (_dashboardSettingsLoadSeq /
_dashboardSettingsWriteSeq), and a failed chip save rolls the dropdown/chip
back. Chip label via textContent (XSS-safe).
Co-authored-by: rodboev <rodboev@users.noreply.github.com>
Rod Boev