Bug bash 2026-09-19: 17 bugs fixed and verified (BUGS.md)

Widgets: a bad pattern no longer silences every widget; malformed layouts load.
Shell: lost session returns to login at once; tab titles; Escape closes menus and dialogs.
Files: names are one path segment; unsaved edits ask before page/machine/tab changes;
only folders that opened are remembered. Terminals: unique default names; 64-char names.
API: queries capped at 10 000 values; 32 streams per client, 512 in all; only
/embed/widget is frameable. ZFS sensors: one unprivileged zpool list, no sudo journal spam.
Phone: 36 px inputs; dataset rows as wide as their cells. Machines: valid name pattern.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

web/src/Shell.tsx

@@ -18,7 +18,7 @@ import MachineSwitcher from './MachineSwitcher'
 import { MachineStatus, setMachine } from './api'
 import { LIST_FLOOR, useRefreshMs } from './prefs'
 import Power from './Power'
-import { Btn, Toasts, toast } from './ui'
+import { Btn, Toasts, okToLeave, toast } from './ui'
 
 // Inline outline icon so it matches the monochrome glyphs in the rail (emoji would be full colour).
 const FolderIcon = (
@@ -91,6 +91,7 @@ export default function Shell({ me: hubMe, onLoggedOut }: { me: Me; onLoggedOut:
 
   // Switching machines: reset everything that belongs to a host, then re-fetch its identity.
   const switchMachine = (name: string | null) => {
+    if (name !== machine && !okToLeave()) return
     setMachine(name); sessionStorage.setItem('hamlab.machine', name ?? ''); if (!name) sessionStorage.removeItem('hamlab.machine')
     handles.current = {}; setTerms([]); setActive(null); setRemoteMe(null); setRemoteErr(''); setDrawer(false); setOnline(true)
     setMachineState(name)
@@ -98,6 +99,8 @@ export default function Shell({ me: hubMe, onLoggedOut }: { me: Me; onLoggedOut:
   }
 
   // keep the hash in step, and follow it when the browser navigates
+  // The tab's title says where you are, so history entries and open tabs can be told apart.
+  useEffect(() => { document.title = `${GROUPS.find((g) => g.id === view)?.label ?? view} · ${machine ?? hubMe.host} — Ham Lab` }, [view, machine, hubMe.host])
   useEffect(() => {
     const want = `#/${machine ?? 'hub'}/${view}`
     if (location.hash !== want) history.pushState(null, '', want)
@@ -172,7 +175,7 @@ export default function Shell({ me: hubMe, onLoggedOut }: { me: Me; onLoggedOut:
       <div className="body">
         <Rail groups={GROUPS} view={view}
           header={<MachineSwitcher hub={hubMe.host} current={machine} machines={machines} onChange={switchMachine} onManage={() => { setView('machines'); setDrawer(false) }} />}
-          onView={(id) => { setView(id as View); setDrawer(false) }} />
+          onView={(id) => { if (id !== view && !okToLeave()) return; setView(id as View); setDrawer(false) }} />
         <div className="backdrop" onClick={() => setDrawer(false)} />
 
         <main className="main" key={machine ?? 'hub'}>