trends sidebar cleanup: minimal display + beige/navy palette

Per Ryan 2026-05-15:
- Removed Vector pass footer (no audience value)
- Removed PHASE 6b comment
- Removed corner brackets + monitoring subtitle + rank prefix
- Top 5 entities now show as Sony +12 / Riedel +8 — entity name
  serif + count mono, right-aligned
- Background #F5EFEB (beige; #F5EFFEB had 7 hex chars, interpreted as
  #F5EFEB) via new --color-trends-bg token
- Text #2F4F5B (navy) via new --color-trends-text token
- Tokens added to redesign-tokens.css palette section

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/styles/redesign-tokens.css

@@ -24,6 +24,10 @@
   --color-text-warning: #f59e0b;
   --color-text-danger: #ef4444;
 
+  /* Trends sidebar palette (Ryan, 2026-05-15) */
+  --color-trends-bg: #F5EFEB;
+  --color-trends-text: #2F4F5B;
+
   /* Type families */
   --font-serif: Georgia, "Times New Roman", "Tinos", serif;
   --font-mono: "JetBrains Mono", "Fira Code", "Courier New", Courier, monospace;