fix(app): settings live-apply — font on open terminals, daemon uptime

- Font change now applies to already-open terminals: the WebGL renderer
  caches glyphs in a texture atlas keyed by the old font/size, so the live
  re-apply effect now calls webglAddon.clearTextureAtlas() (via a new ref)
  after updating fontFamily/fontSize, before refitting.
- Daemon uptime now reflects a restart: the Settings daemon section ticks
  every second for live uptime, and Stop/Restart trigger an onReload callback
  that re-fetches health/status in App so a restarted daemon's new
  started_at_ms is shown instead of the stale value.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/src/App.tsx

@@ -170,7 +170,7 @@ export function App() {
           />
         )}
       </div>
-      {settingsOpen && config && <Settings config={config} health={health} onClose={() => setSettingsOpen(false)} />}
+      {settingsOpen && config && <Settings config={config} health={health} onClose={() => setSettingsOpen(false)} onReload={() => { void loadHealth(); void refresh(); }} />}
       {wizard && <Wizard onDone={(id) => { setWizard(false); setActiveId(id); void refresh(); }} onCancel={() => setWizard(false)} />}
       {deleteTarget && (
         <ConfirmDelete