feat: ШАГ 4 — UI для browser events в TodayScreen

Go bindings:
- bindings_browser.go: ListBrowserEvents, CountPendingBrowserEvents,
  AcceptBrowserEvent, DismissBrowserEvent, AttachBrowserEventToNode

Frontend:
- BrowserEvents.svelte — компонент списка событий с действиями
  (принять/прикрепить/удалить), статусы, домены, длительность
- TodayScreen.svelte — новая вкладка «Браузер» с badge
- App.svelte — loadBrowserEvents, acceptBrowserEvent,
  dismissBrowserEvent, attachBrowserEvent handlers

frontend/src/lib/TodayScreen.svelte

@@ -1,5 +1,6 @@
 <script>
   import { t } from './i18n'
+  import BrowserEvents from './BrowserEvents.svelte'
 
   export let todayDashboard = null
   export let suggestions = []
@@ -22,6 +23,14 @@
   export let onOpenInboxArtifact = (item) => {}
   export let onOpenTrashNode = (nodeId) => {}
 
+  // Browser events
+  export let browserEvents = []
+  export let browserLoading = false
+  export let onBrowserAccept = (ev) => {}
+  export let onBrowserDismiss = (ev) => {}
+  export let onBrowserAttach = (ev) => {}
+  export let onBrowserRefresh = () => {}
+
   let activeTab = 'feed'
 
   function pluralize(n, one, few, many) {
@@ -172,6 +181,10 @@
       {t('today.captured')}
       {#if todayCaptures.length > 0}<span class="tab-badge">{todayCaptures.length}</span>{/if}
     </button>
+    <button class="today-tab" class:active={activeTab === 'browser'} on:click={() => activeTab = 'browser'}>
+      Браузер
+      {#if browserEvents.length > 0}<span class="tab-badge">{browserEvents.length}</span>{/if}
+    </button>
   </div>
 
   {#if activeTab === 'feed'}
@@ -328,6 +341,18 @@
         </div>
       {/if}
     </div>
+  {:else if activeTab === 'browser'}
+    <div class="today-tab-content">
+      <BrowserEvents
+        events={browserEvents}
+        loading={browserLoading}
+        {formatTime}
+        onAccept={onBrowserAccept}
+        onDismiss={onBrowserDismiss}
+        onAttach={onBrowserAttach}
+        onRefresh={onBrowserRefresh}
+      />
+    </div>
   {/if}
 </div>