Remove unnecessary snapshot refresh from session cards

- Removed 10-second refresh interval that was fetching new snapshots continuously
- Initial snapshot load is sufficient for session card preview
- Reduces server load and unnecessary network requests
- Session cards now load once and display static snapshot content
- Interactive session view still provides real-time updates via streaming

🤖 Generated with [Claude Code](https://claude.ai/code)

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

web/src/client/components/session-card.ts

@@ -29,13 +29,11 @@ export class SessionCard extends LitElement {
   @state() private killing = false;
   @state() private killingFrame = 0;
 
-  private refreshInterval: number | null = null;
   private killingInterval: number | null = null;
 
   firstUpdated(changedProperties: PropertyValues) {
     super.firstUpdated(changedProperties);
     this.setupTerminal();
-    this.startRefresh();
   }
 
   updated(changedProperties: PropertyValues) {
@@ -52,9 +50,6 @@ export class SessionCard extends LitElement {
 
   disconnectedCallback() {
     super.disconnectedCallback();
-    if (this.refreshInterval) {
-      clearInterval(this.refreshInterval);
-    }
     if (this.killingInterval) {
       clearInterval(this.killingInterval);
     }
@@ -117,15 +112,6 @@ export class SessionCard extends LitElement {
     }
   }
 
-  private startRefresh() {
-    this.refreshInterval = window.setInterval(async () => {
-      if (this.terminal) {
-        const url = `/api/sessions/${this.session.id}/snapshot`;
-        await this.loadSnapshot(url);
-      }
-    }, 10000); // Refresh every 10 seconds
-  }
-
   private handleCardClick() {
     this.dispatchEvent(
       new CustomEvent('session-select', {