Fix post-create redirect and add bracket filter to jobs list

- After job creation always redirect to /jobs (never bracket detail)
- If a bracket was involved, redirect to /jobs?bracket_id=X instead
- GET /jobs?bracket_id=X filters the list and shows a dismissible bracket badge
- Amount label now says '(≥2 creates a bracket)' to make the side effect clear

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

app/templates/jobs.html

@@ -21,7 +21,14 @@
     {% endif %}
   </div>
 </form>
-{% if q %}
+{% if active_bracket %}
+<div class="d-flex align-items-center gap-2 mb-3">
+  <span class="badge bg-secondary fs-6 fw-normal px-3 py-2">
+    <i class="bi bi-collection me-1"></i>{{ active_bracket.name }}
+  </span>
+  <a href="/jobs{% if q %}?q={{ q }}{% endif %}" class="text-secondary text-decoration-none small">× clear filter</a>
+</div>
+{% elif q %}
 <p class="text-secondary small mb-3">Results for <strong class="text-white">{{ q }}</strong></p>
 {% endif %}
 
@@ -180,11 +187,13 @@
 
           <div class="row g-3">
             <div class="col-md-4">
-              <label class="form-label text-secondary small">Amount</label>
+              <label class="form-label text-secondary small">
+                Amount
+                <span class="text-secondary fw-normal">(≥2 creates a bracket)</span>
+              </label>
               <input type="number" name="amount"
                      class="form-control bg-dark border-secondary text-white"
-                     value="1" min="1" max="500"
-                     title="&gt;1 auto-creates a bracket">
+                     value="1" min="1" max="500">
             </div>
             <div class="col-md-8">
               <label class="form-label text-secondary small">