feat(dees-tile): unify tile metadata into a consistent bottom info bar and add PDF file-size display

ts_web/elements/00group-media/dees-tile-shared/DeesTileBase.ts

@@ -59,9 +59,7 @@ export abstract class DeesTileBase extends DeesElement {
 
         ${!this.loading && !this.error ? this.renderTileContent() : ''}
 
-        ${this.label ? html`
-          <div class="tile-label">${this.label}</div>
-        ` : ''}
+        ${this.renderBottomBar()}
       </div>
     `;
   }
@@ -69,6 +67,11 @@ export abstract class DeesTileBase extends DeesElement {
   /** Subclasses implement this to render their specific content */
   protected abstract renderTileContent(): TemplateResult;
 
+  /** Subclasses override this to render a bottom info bar with metadata */
+  protected renderBottomBar(): TemplateResult | string {
+    return '';
+  }
+
   public async connectedCallback(): Promise<void> {
     await super.connectedCallback();
     this.setupIntersectionObserver();