Workspace polish: milestone selector, streaming fix, push fix, log quieting

- WorkspaceTaskPanel: add milestone <select> in task detail (PATCH /api/notes/:id),
  replace delete ✕ with trash can SVG icon
- WorkspaceView: scroll to bottom when streaming ends so final message is visible
  without a page refresh
- ToolCallCard: fix search_notes result count (was reading data.total; tool returns
  data.count), so results no longer show "0 found"
- push.py: switch from deprecated WebPusher().send(vapid_private_key=...) to
  webpush() function (pywebpush 2.x API compatibility)
- app.py: downgrade /api/health, /api/chat/status, and static asset requests from
  INFO to DEBUG in after_request logger to reduce log noise at default log level

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

frontend/src/components/ToolCallCard.vue

@@ -262,7 +262,7 @@ async function applyTag(tag: string) {
       <span v-else class="tool-search-info">No notes found</span>
     </template>
     <template v-else-if="searchResults">
-      <span class="tool-search-info">{{ (toolCall.result.data?.total as number) ?? 0 }} found</span>
+      <span class="tool-search-info">{{ (toolCall.result.data?.count as number) ?? (toolCall.result.data?.total as number) ?? 0 }} found</span>
       <div class="tool-search-results">
         <router-link
           v-for="r in searchResults"