Fix sidebar username, Signals filter clarity and layout

- JWT now carries a username claim; sidebar shows "Signed in as <name>"
  instead of the bare user id (sub). Re-login required for the new claim.
- Signals: Min R:R / Min Confidence inputs reflect the effective filter —
  auto-filled from the activation gate when "Qualified only" is on, reset
  to 0 when off (no more misleading 0 while the gate is active).
- Signals layout: Run Scanner moved to its own action row (it's a job
  trigger, not a filter); qualified toggle grouped with the refinement
  filters under one Filters panel.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/components/ticker/RecommendationPanel.tsx

@@ -60,8 +60,14 @@ function TargetTable({ setup }: { setup: TradeSetup }) {
         </thead>
         <tbody>
           {setup.targets.map((target) => (
-            <tr key={`${setup.id}-${target.sr_level_id}-${target.price}`} className="border-b border-white/[0.04]">
-              <td className="py-2 pr-3 text-gray-300">{target.classification}</td>
+            <tr
+              key={`${setup.id}-${target.sr_level_id}-${target.price}`}
+              className={`border-b border-white/[0.04] ${target.is_primary ? 'bg-blue-400/10' : ''}`}
+            >
+              <td className="py-2 pr-3 text-gray-300">
+                {target.is_primary && <span className="mr-1 text-blue-300">★</span>}
+                {target.classification}
+              </td>
               <td className="py-2 pr-3 font-mono text-gray-200">{formatPrice(target.price)}</td>
               <td className="py-2 pr-3 font-mono text-gray-200">{formatPercent((target.distance_from_entry / setup.entry_price) * 100)}</td>
               <td className="py-2 pr-3 font-mono text-gray-200">{target.rr_ratio.toFixed(2)}</td>