feat: add text search to All Tasks page

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

templates/tasks.html

@@ -13,6 +13,7 @@
 
 <!-- Filters -->
 <form class="filters-bar" method="get" action="/tasks">
+    <input type="text" name="search" value="{{ current_search }}" placeholder="Search tasks..." class="filter-select" style="min-width:160px">
     <select name="status" class="filter-select" data-auto-submit onchange="this.form.submit()">
         <option value="">All Statuses</option>
         <option value="open" {{ 'selected' if current_status == 'open' }}>Open</option>
@@ -46,6 +47,10 @@
         <option value="created_at" {{ 'selected' if current_sort == 'created_at' }}>Newest</option>
         <option value="title" {{ 'selected' if current_sort == 'title' }}>Title</option>
     </select>
+    <button type="submit" class="btn btn-ghost btn-xs">Search</button>
+    {% if current_search or current_domain_id or current_project_id or current_status or current_priority or current_context %}
+    <a href="/tasks" class="btn btn-ghost btn-xs" style="color:var(--red)">Clear</a>
+    {% endif %}
 </form>
 
 <!-- Task List -->