Rework Dashboard, add toasts, container folders/icons/WebUI links, detail tabs

Dashboard:
- Plain-count stat tiles (Running/Stopped/Pods/Images/Volumes/Networks)
  separated from a single "Resource Usage" card (CPU/Memory/Swap/Storage
  meter rows) instead of forcing both into one tile grid, which produced
  awkward spanning-tile/dead-cell layouts.
- Fixed CPU usage never changing (libpod's own cpuUtilization is computed
  once and never resampled) by computing it from /proc/stat deltas instead.
- Fixed memory usage reading far too high by using /proc/meminfo's
  MemAvailable instead of libpod's raw (non-reclaimable-aware) memFree.
- Added an Autostart Queue table reusing podman-autostart.sh's own
  failure-counter files.
- Dashboard and Containers now auto-refresh every ~2s (paused when the
  tab is hidden or a modal is open).

Toasts:
- Real success/warn/error/info toast notifications replacing every
  alert() used for one-way feedback, across every panel.

Container detail modal:
- 5 new tabs: Resources, Logs, Console, Events, Healthcheck.

Containers panel:
- Folders to group containers (name + icon), stored in the plugin's own
  folders.json — a folder's header always shows an icon+name+status chip
  per member, matching Unraid's own Docker page folders. "Move to
  Folder" becomes "Remove from Folder" once a container is already
  grouped.
- Containers can carry an icon URL and a WebUI URL (small button next to
  the name), both stored as container labels and auto-filled from
  templates where applicable.
- Settings: an "Add container" control for the Autostart order table.

Fixes:
- Context menus now measure their own rendered size and flip above the
  anchor when there isn't room below, instead of running off-screen.
- Containers table now uses table-layout:fixed with explicit column
  widths — auto layout was shifting every column (and the header) on
  every folder expand/collapse, and briefly again when a flex wrapper
  was mistakenly placed directly on a <td>.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

webui/plugins/podman/javascript/app.js

@@ -126,6 +126,60 @@ window.Podman = (function () {
     return '<tr><td colspan="' + colspan + '" class="podman-error">' + escapeHtml(message) + '</td></tr>';
   }
 
+  // --- Toast notifications ----------------------------------------------------
+  //
+  // Replaces alert() for one-way feedback ("Saved.", "Removed 3 image(s)",
+  // "Save failed: ..."). Confirmations stay native confirm() — a toast is
+  // for telling the user something happened, not for asking them a
+  // yes/no question. Command output that can run to hundreds of lines
+  // (e.g. `podman compose up`) stays in the existing openLogModal()
+  // pattern instead — a toast has to stay short and auto-dismiss, which
+  // doesn't fit a scrolling log.
+
+  const TOAST_ICON = { success: '✓', warn: '!', error: '✕', info: 'ℹ' };
+  const TOAST_DURATION_MS = { success: 4000, warn: 5000, error: 7000, info: 4000 };
+  let toastContainer = null;
+
+  function toastRoot() {
+    if (!toastContainer) {
+      toastContainer = document.createElement('div');
+      toastContainer.className = 'podman-toast-container';
+      (document.querySelector('.podman-plugin') || document.body).appendChild(toastContainer);
+    }
+    return toastContainer;
+  }
+
+  /**
+   * @param {string} message
+   * @param {('success'|'warn'|'error'|'info')} [type='info']
+   */
+  function toast(message, type) {
+    const kind = TOAST_ICON[type] ? type : 'info';
+    const root = toastRoot();
+
+    const node = document.createElement('div');
+    node.className = 'podman-toast podman-toast-' + kind;
+    node.innerHTML =
+      '<span class="ico">' + TOAST_ICON[kind] + '</span>' +
+      '<span class="msg"></span>' +
+      '<button type="button" class="close" aria-label="Dismiss">&#10005;</button>';
+    node.querySelector('.msg').textContent = message;
+    root.appendChild(node);
+
+    let dismissed = false;
+    function dismiss() {
+      if (dismissed) return;
+      dismissed = true;
+      node.classList.add('leaving');
+      // Not animationend — that never fires when prefers-reduced-motion
+      // disables the animation (podman.css sets animation:none for it),
+      // which would leave the toast stuck on screen forever.
+      setTimeout(function () { node.remove(); }, 160);
+    }
+    node.querySelector('.close').addEventListener('click', dismiss);
+    setTimeout(dismiss, TOAST_DURATION_MS[kind]);
+  }
+
   // --- Modal form dialog -----------------------------------------------------
 
   /**
@@ -299,12 +353,32 @@ window.Podman = (function () {
         (item.disabled ? ' disabled' : '') + '>' + escapeHtml(item.label) + '</button>';
     }).join('');
 
+    (document.querySelector('.podman-plugin') || document.body).appendChild(menu);
+
     // Viewport-relative (see the "position: fixed" comment on
     // .podman-context-menu in podman.css) — no scrollY/scrollX added.
+    // Measured AFTER appending (not assumed) since the menu's height
+    // varies with its item count — a long menu (e.g. a container's row
+    // menu with Details/Pause/Kill/Rename/Edit/Remove) opened from a row
+    // near the bottom of the viewport used to run off-screen with no way
+    // to reach its last few items. Flips above the anchor instead when
+    // there isn't enough room below, and clamps horizontally the same way.
     const rect = anchorEl.getBoundingClientRect();
-    menu.style.top = (rect.bottom + 4) + 'px';
-    menu.style.left = (rect.right - 180) + 'px';
-    (document.querySelector('.podman-plugin') || document.body).appendChild(menu);
+    const menuRect = menu.getBoundingClientRect();
+    const margin = 8;
+
+    let top = rect.bottom + 4;
+    if (top + menuRect.height > window.innerHeight - margin) {
+      top = rect.top - menuRect.height - 4;
+    }
+    top = Math.max(margin, top);
+
+    let left = rect.right - menuRect.width;
+    left = Math.min(left, window.innerWidth - menuRect.width - margin);
+    left = Math.max(margin, left);
+
+    menu.style.top = top + 'px';
+    menu.style.left = left + 'px';
 
     // menu.children includes the separator <div>s too, so indexing into it
     // directly (by a counter that only advances for real items) drifts by
@@ -399,6 +473,29 @@ window.Podman = (function () {
     // (Dashboard, by default — see Podman.page).
     const initial = document.querySelector('.podman-subnav button.active');
     activatePanel(initial ? initial.dataset.panel : 'dashboard');
+
+    setInterval(autoRefreshTick, AUTO_REFRESH_INTERVAL_MS);
+  }
+
+  // Only panels that opt in via `autoRefresh: true` (Dashboard, Containers)
+  // get polled — most panels (Settings, Compose, Terminal, ...) have
+  // in-progress forms or connections an unexpected refresh would disrupt.
+  // Paused while the tab is hidden (nothing to look at) and while any
+  // modal is open (a full-panel re-render mid-edit would be jarring),
+  // rather than fighting those cases with more state.
+  const AUTO_REFRESH_INTERVAL_MS = 2000;
+
+  function autoRefreshTick() {
+    if (document.hidden) return;
+    if (document.querySelector('.podman-modal-backdrop')) return;
+
+    const activeBtn = document.querySelector('.podman-subnav button.active');
+    if (!activeBtn) return;
+    const name = activeBtn.dataset.panel;
+    const module = panelModules[name];
+    if (module && module.autoRefresh && initialized[name] && typeof module.refresh === 'function') {
+      module.refresh();
+    }
   }
 
   document.addEventListener('DOMContentLoaded', boot);
@@ -414,6 +511,7 @@ window.Podman = (function () {
     stateChipClass: stateChipClass,
     loadingRow: loadingRow,
     errorRow: errorRow,
+    toast: toast,
     openFormModal: openFormModal,
     openLogModal: openLogModal,
     openContextMenu: openContextMenu,