Close DV-01–04,07,09,13,14: unify operator-deck UX in server/web.

Standardize neon cyan on #00e8f5, wire SacredPageHeader across Builds/Path Tracer/LOTL, dedupe Pages.css, align Path Tracer chrome, drop dead wealth-deck CSS, add prefers-color-scheme shell + HelpTip, sidebar version from package.json build inject, and Vitest CSS regression guards.

server/web/src/help/terminalRenderCap.test.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from 'vitest';
+import { TERM_RENDER_CAP, visibleTerminalLines } from './terminalRenderCap';
+
+describe('terminalRenderCap', () => {
+  it('renders only the newest window at cap', () => {
+    const lines = Array.from({ length: TERM_RENDER_CAP + 25 }, (_, i) => `line-${i}`);
+    const { visible, truncated, hidden } = visibleTerminalLines(lines);
+    expect(visible).toHaveLength(TERM_RENDER_CAP);
+    expect(visible[0]).toBe('line-25');
+    expect(truncated).toBe(true);
+    expect(hidden).toBe(25);
+  });
+});