fix(plugins): reset pluginsInitialized on HTMX re-swap; use refreshInstalledPlugins in refreshPlugins

HTMX's `revealed` trigger fires each time the plugins tab becomes
visible (Alpine's x-show toggles display:none which re-triggers the
IntersectionObserver). Each re-reveal fetches a fresh empty HTML
skeleton via hx-swap="innerHTML". The htmx:afterSwap handler reset
window.pluginManager.initialized/initializing but not pluginsInitialized,
so initializePlugins() hit its guard and skipped loadInstalledPlugins()
and searchPluginStore() — leaving the fresh empty DOM unpopulated.

Fix: also reset pluginsInitialized = false in the afterSwap handler.
Existing caches (3s for installed plugins, 5min for store) mean tab
revisits within the TTL render from cache instantly with no extra
API traffic.

Also change refreshPlugins() to call refreshInstalledPlugins() (which
already exists and explicitly invalidates the cache) instead of the
bare loadInstalledPlugins() call that could silently skip the fetch
if the 3-second cache happened to still be valid.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web_interface/static/v3/plugins_manager.js

@@ -1165,9 +1165,10 @@ function initializePluginPageWhenReady() {
         if (target.id === 'plugins-content' ||
             target.querySelector('#installed-plugins-grid')) {
             console.log('HTMX swap detected for plugins, initializing...');
-            // Reset initialization flag to allow re-initialization after HTMX swap
+            // Reset all initialization flags so the fresh empty DOM gets populated
             window.pluginManager.initialized = false;
             window.pluginManager.initializing = false;
+            pluginsInitialized = false;
             initTimer = setTimeout(attemptInit, 100);
         }
     }, { once: false }); // Allow multiple swaps
@@ -5127,7 +5128,7 @@ function refreshPlugins() {
     pluginStoreCache = null;
     cacheTimestamp = null;
 
-    loadInstalledPlugins();
+    refreshInstalledPlugins(); // invalidates cache before fetching
     // Fetch latest metadata from GitHub when refreshing
     searchPluginStore(true);
     showNotification('Plugins refreshed with latest metadata from GitHub', 'success');