fix: corregir a11y en Hourglass/Popover; quitar role redundante

Co-authored-by: aider (openrouter/openai/gpt-5) <aider@aider.chat>

apps/web/src/lib/ui/data/TaskItem.svelte

@@ -576,8 +576,6 @@
 		background: var(--color-primary);
 		color: #fff;
 	}
-	.btn.secondary {
-	}
 	.btn.ghost {
 		background: transparent;
 	}

apps/web/src/lib/ui/feedback/Popover.svelte

@@ -72,7 +72,14 @@
 </script>
 
 {#if open}
-  <div class="popover-overlay" on:click={close} />
+  <div
+    class="popover-overlay"
+    role="button"
+    tabindex="0"
+    aria-label="Cerrar"
+    on:click={close}
+    on:keydown={(e) => { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); close(); } }}
+  ></div>
   <div
     class="popover-panel"
     role="dialog"

apps/web/src/lib/ui/icons/Hourglass.svelte

@@ -1,8 +1,8 @@
 <script lang="ts">
   export let size: number = 16;
   export let className: string = '';
-  export let ariaLabel?: string;
-  export let title?: string;
+  export let ariaLabel: string | undefined;
+  export let title: string | undefined;
 </script>
 
 <svg

apps/web/src/lib/ui/layout/AppShell.svelte

@@ -38,7 +38,7 @@
   <slot />
 </main>
 
-<nav class="tabbar" role="navigation" aria-label="Navegación inferior">
+<nav class="tabbar" aria-label="Navegación inferior">
   <a href="/app" class:active={$page.url.pathname === '/app'} aria-label="Tareas">
     <span class="icon">✅</span>
     <span class="label">Tareas</span>