Replace the mobile tab bar with a hamburger menu

Six tabs (Queue, On-call, Alerts, Team, Admin, Account) had already
outgrown the bottom bar once: 56b8191 let it auto-size its columns to
fit however many there were, but on a phone that only left each tab
55-65px wide. Squeezing further wasn't an option, so the bar is gone
on mobile and a hamburger button in the topbar opens a menu instead.

The menu reuses the sheet + menu-item pattern already used for the
snooze and assign-to actions in incident.js, rather than a new overlay
component. It lists the same sections the sidebar does, including
hiding Admin for non-admins, and the triggered-incident badge that
used to sit on the Queue tab icon now shows on the hamburger button.

Desktop (>=900px) is untouched: the sidebar is the same markup, CSS
alone hides it below 900px and shows it above, so nothing there
changed behaviourally.

Claude-Session: https://claude.ai/code/session_01RHPj4ggeFdEjKKfm4SHbD7

internal/web/static/js/app.js

@@ -30,6 +30,17 @@ const SECTIONS = {
   more: { title: 'Account', view: account },
 };
 
+// The mobile hamburger menu's contents — the same sections the desktop
+// sidebar's .nav-link list carries in index.html, in the same order.
+const NAV_ITEMS = [
+  { path: '/', section: 'queue', label: 'Queue', icon: 'queueList' },
+  { path: '/oncall', section: 'oncall', label: 'On-call', icon: 'calendar' },
+  { path: '/alerts', section: 'alerts', label: 'Alerts', icon: 'bell' },
+  { path: '/team', section: 'team', label: 'Team', icon: 'team' },
+  { path: '/admin', section: 'admin', label: 'Admin', icon: 'shield', adminOnly: true },
+  { path: '/more', section: 'more', label: 'Account', icon: 'user' },
+];
+
 function parseRoute(pathname) {
   const m = pathname.match(/^\/incidents\/(\d+)\/?$/);
   if (m) return { section: 'queue', incident: Number(m[1]) };
@@ -132,6 +143,35 @@ function render() {
   updateTitle();
 }
 
+// ---------- nav menu ----------
+
+// The mobile hamburger menu: same shape as the sheet-based action menus in
+// incident.js (openSheet + a <ul class="menu"> of menu-item buttons), one
+// item per NAV_ITEMS entry, resolving with a path for navigate() to use.
+function openNavMenu() {
+  const current = SECTIONS[route.section].nav || route.section;
+  const triggered = state.open.filter((i) => i.status === 'triggered').length;
+  const items = NAV_ITEMS.filter((n) => !n.adminOnly || state.me?.user?.is_admin);
+  ui.openSheet(() => [
+    ui.h('h2', { class: 'sheet-title', text: 'Sections' }),
+    ui.h('ul', { class: 'menu', role: 'menu' }, items.map((n) =>
+      ui.h('li', {}, ui.h('button', {
+        class: 'menu-item',
+        type: 'button',
+        role: 'menuitemradio',
+        'aria-checked': String(n.section === current),
+        onclick: () => ui.closeSheet(n.path),
+      },
+        ui.icon(n.icon),
+        n.label,
+        n.section === 'queue' && triggered > 0 && ui.badge(String(triggered), 'st-triggered menu-sub'),
+      ))),
+    ),
+  ]).then((path) => {
+    if (path) navigate(path);
+  });
+}
+
 // ---------- refresh + badges ----------
 
 async function refresh() {
@@ -158,9 +198,12 @@ function updateBadges() {
   pill.classList.toggle('has-triggered', triggered > 0);
   pill.classList.toggle('all-acked', open > 0 && triggered === 0);
 
-  const badge = document.querySelector('[data-badge]');
-  badge.hidden = triggered === 0;
-  badge.textContent = String(triggered);
+  // Two badges carry this count: the sidebar's Queue tab (desktop) and the
+  // hamburger button (mobile) — only one of the two is ever visible at once.
+  for (const badge of document.querySelectorAll('[data-badge]')) {
+    badge.hidden = triggered === 0;
+    badge.textContent = String(triggered);
+  }
   updateTitle();
 }
 
@@ -180,6 +223,7 @@ async function boot() {
   document.addEventListener('keydown', onKey);
   $('login-form').addEventListener('submit', onLogin);
   $('signup-form').addEventListener('submit', onSignup);
+  $('menu-btn').addEventListener('click', openNavMenu);
 
   // /signup is the one route that works without a session.
   if (location.pathname.replace(/\/$/, '') === '/signup') {

internal/web/static/js/ui.js

@@ -34,6 +34,10 @@ export function clear(el, ...children) {
 const ICONS = {
   back: ['M15 18l-6-6 6-6'],
   more: ['M5 12h.01M12 12h.01M19 12h.01'],
+  queueList: ['M4 6h16M4 12h16M4 18h10'],
+  calendar: ['rect:3.5,5,17,15,2', 'M3.5 10h17M8 3v4M16 3v4'],
+  team: ['circle:9,8,3', 'circle:17,9,2.5', 'M3 19a6 6 0 0 1 12 0M15 19a5 5 0 0 1 6-4'],
+  shield: ['M12 3l7 3v6c0 4-3 7-7 9-4-2-7-5-7-9V6z'],
   check: ['M5 12.5l4.5 4.5L19 7'],
   checkCircle: ['M8 12.5l3 3 5-6', 'circle:12,12,9'],
   undo: ['M9 14L4 9l5-5', 'M4 9h10a6 6 0 0 1 0 12h-3'],
@@ -64,6 +68,14 @@ export function icon(name, cls = 'icon') {
       node.setAttribute('cx', cx);
       node.setAttribute('cy', cy);
       node.setAttribute('r', r);
+    } else if (d.startsWith('rect:')) {
+      const [x, y, w, hgt, rx] = d.slice(5).split(',');
+      node = document.createElementNS(SVG, 'rect');
+      node.setAttribute('x', x);
+      node.setAttribute('y', y);
+      node.setAttribute('width', w);
+      node.setAttribute('height', hgt);
+      if (rx) node.setAttribute('rx', rx);
     } else {
       node = document.createElementNS(SVG, 'path');
       node.setAttribute('d', d);