Add GPU/macvlan passthrough, container edit/update, image prune/tag

Create Container form:
- GPU passthrough dropdown (AMD/Intel via /dev/dri detection, NVIDIA
  excluded since it needs a different runtime) - device paths strictly
  validated server-side against the host's own detected list.
- Macvlan network support: selecting a macvlan network reveals a static
  IP field and hides port mappings (meaningless once the container has
  its own LAN address), matching Unraid Docker Manager's "Custom: br0"
  behavior. Networks panel gained a matching macvlan network-creation
  flow, with the parent-interface dropdown read from Unraid's own
  network.cfg so it lists exactly what Docker Manager itself offers.

Containers panel:
- Edit: reopens the create form pre-filled from the container's current
  config (image/ports/volumes/env/network/restart policy/GPU/static IP);
  saving stops+removes the old container and recreates it under the same
  settings, since podman/Docker have no in-place "modify" API for most of
  this.
- Update: same stop/remove/recreate flow, but pulls the current image
  first. "Check for Updates" compares each in-use image's local digest
  against its origin registry (Docker Hub/GHCR/self-hosted registries all
  verified live) with no podman-side feature backing it - implemented via
  the registry's own HTTP API. A small log-modal shows progress for both
  actions instead of a silent wait.
- Fixed a real bug hit live: PodmanClient's flat 15s HTTP timeout aborted
  real image pulls/container creates mid-request; bumped to 600s (nginx
  already allows up to 640s for this plugin's requests).

Images panel:
- "Prune unused" (removes every image with zero containers referencing
  it, not just dangling ones - confirmation copy says so explicitly since
  this is more aggressive than it sounds) and per-image "Tag".

Also several real UI bugs found via live screenshots: unused-image prune
having no visible effect until reloaded, table action-button columns
drifting row to row (a bare "display:flex" on a <td> was fighting the
table layout algorithm), Templates category badges dumping raw multi-tag
strings from real Unraid templates, and low-contrast search/filter
controls that were nearly invisible against the card background.

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

webui/plugins/podman/javascript/app.js

@@ -229,6 +229,53 @@ window.Podman = (function () {
     });
   }
 
+  /**
+   * Small modal with a scrolling monospace log pane — for actions that run
+   * several steps in sequence (checking/updating containers) where a plain
+   * confirm()/alert() at the very end leaves the user with no feedback
+   * that anything is happening while it runs. Returns {log, done} rather
+   * than closing itself, since the caller knows when the whole sequence
+   * (not just one call) has actually finished.
+   *
+   * @param {string} title
+   * @returns {{log: (line: string) => void, done: (closeLabel?: string) => void}}
+   */
+  function openLogModal(title) {
+    const backdrop = document.createElement('div');
+    backdrop.className = 'podman-modal-backdrop';
+    backdrop.innerHTML = '' +
+      '<div class="podman-modal podman-modal-wide" role="dialog" aria-modal="true">' +
+      '<div class="podman-modal-head"><h3>' + escapeHtml(title) + '</h3></div>' +
+      '<div class="podman-modal-body"><div class="podman-log-pane" id="podman-log-modal-pane"></div></div>' +
+      '<div class="podman-modal-actions"><button type="button" class="podman-btn podman-btn-primary" data-role="close" disabled>Working…</button></div>' +
+      '</div>';
+
+    (document.querySelector('.podman-plugin') || document.body).appendChild(backdrop);
+    const pane = backdrop.querySelector('#podman-log-modal-pane');
+    const closeBtn = backdrop.querySelector('[data-role="close"]');
+
+    function close() { backdrop.remove(); }
+    closeBtn.addEventListener('click', close);
+    backdrop.addEventListener('click', function (e) { if (e.target === backdrop) close(); });
+    document.addEventListener('keydown', function onKey(e) {
+      if (e.key === 'Escape' && !closeBtn.disabled) { close(); document.removeEventListener('keydown', onKey); }
+    });
+
+    function log(line) {
+      const row = document.createElement('div');
+      row.textContent = line;
+      pane.appendChild(row);
+      pane.scrollTop = pane.scrollHeight;
+    }
+
+    function done(closeLabel) {
+      closeBtn.disabled = false;
+      closeBtn.textContent = closeLabel || 'Close';
+    }
+
+    return { log: log, done: done };
+  }
+
   /**
    * Small anchored dropdown menu — used for secondary per-row actions
    * (pause/kill/rename/...) that would otherwise clutter a table row with
@@ -368,6 +415,7 @@ window.Podman = (function () {
     loadingRow: loadingRow,
     errorRow: errorRow,
     openFormModal: openFormModal,
+    openLogModal: openLogModal,
     openContextMenu: openContextMenu,
     registerPanel: registerPanel,
     activatePanel: activatePanel,