fix: second-wave bug fixes, security hardening, visual polish, UX improvements

Bug fixes:
- SRV-B1 through B5: server config, router, server_info, syscheck corrections
- BA-03 through BA-06: builder path and universal build cleanup (BLD-D1 through D3)
- Frontend WS race condition and useVisibleInterval hook fixed
- Drive-root path bug in PathForge resolved
- Upload error handling improved

Security:
- PathForge path traversal guard added
- Script injection escaping applied throughout

Visual (DV-01 through DV-15):
- Cyan design tokens and page headers standardised
- Dead CSS removed from Pages.css, PathTracerPage.css, wealth-deck.css
- SacredPageHeader deleted (replaced inline); sidebar version display fixed

UX:
- Emberwake request storm fixed (EmberwakePage.tsx)
- Help blurbs UH-01, UH-02, UH-06 added
- HelpTips wired into Crucible, Fleet (FleetGroupsStrip, FleetToolbar), Settings

Build:
- vite.config.ts: webroot auto-sync on build
- build_universal.go: universal build artifact cleanup
- PROBLEMS.md tracking updated

server/web/src/styles/wealth-deck.css

@@ -58,15 +58,6 @@
   color: var(--accent-red);
 }
 
-.chart-live.sample {
-  color: var(--brass-light);
-  text-shadow: 0 0 8px rgba(232, 197, 71, 0.35);
-}
-
-.chart-live.blend {
-  color: var(--neon-amber);
-}
-
 .chart-empty.wealth-empty {
   min-height: 280px;
   background: linear-gradient(180deg, rgba(201, 162, 39, 0.04), transparent);