rename: Slot Picture -> Signal Confluence + fix symbol disappearing

- Tab label, panel title, ariaLabel, and explanatory text all updated
- Add visible symbol badge below autocomplete input so user always sees
  what symbol they're viewing after picking from search results

app/src/app/confluence/page.tsx

@@ -5,7 +5,7 @@ import { ConfluencePanel } from '@/components/ConfluencePanel';
 import { CorridorPanel } from '@/components/CorridorPanel';
 
 const TABS = [
-  { id: 'confluence', label: 'Slot Picture' },
+  { id: 'confluence', label: 'Signal Confluence' },
   { id: 'corridor', label: 'Price Corridor' },
 ] as const;
 

app/src/components/ConfluencePanel.tsx

@@ -110,7 +110,7 @@ export function ConfluencePanel() {
     <div className="space-y-6">
       {/* Explanatory text */}
       <div className="text-xs text-fg-muted leading-relaxed">
-        Slot Picture combines technical, seasonal, and valuation signals into a single
+        Signal Confluence combines technical, seasonal, and valuation signals into a single
         directional read. Each slot fires (green dot) when its condition is met, or stays
         dormant. The overall quality grade reflects how many slots fired and in which direction.
         Use the rack selector to switch between different signal subsets.
@@ -125,10 +125,15 @@ export function ConfluencePanel() {
               onPick={pickSymbol}
               onSubmitRaw={(raw) => pickSymbol(raw.toUpperCase())}
               placeholder="Search symbol…"
-              ariaLabel="Select symbol for slot picture"
+              ariaLabel="Select symbol for signal confluence"
               inputClassName="w-full bg-surface-sunken border border-line rounded-lg px-3 py-1.5 text-xs text-fg placeholder:text-fg-muted focus:outline-none focus:border-accent focus:ring-1 focus:ring-accent"
             />
           </div>
+          {symbol && (
+            <span className="mt-1 inline-flex items-center rounded bg-accent/10 border border-accent/30 px-2 py-0.5 text-xs font-medium text-accent">
+              {symbol}
+            </span>
+          )}
         </div>
         <div>
           <label className="block text-xs text-fg-muted mb-1">Rack</label>
@@ -147,7 +152,7 @@ export function ConfluencePanel() {
         </div>
       </div>
 
-      {/* Picture quality + evidence summary */}
+      {/* Quality + evidence summary */}
       {quality ? (
         <div className="flex flex-wrap items-center gap-4">
           <div className={`inline-flex items-center gap-2 rounded border px-3 py-1.5 text-sm font-medium ${QUALITY_COLOR[quality]}`}>