feat(ai): extend FluxAI navigation with cross-page routing

The navigate_to_section tool now supports two modes:
A) Same-page scroll — scrollIntoView to real homepage DOM IDs
   (technology, applications-dashboard, applications-deep, global,
   our-story, legacy)
B) Cross-page routing — router.push to /applications/{slug},
   /news, /heritage, /parts with automatic locale prefix.

Fixed: system prompt listed phantom section IDs (hero, news,
heritage, timeline, parts-catalog, contact) that don't exist in
the DOM — causing all non-homepage navigations to silently fail.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/api/chat/route.ts

@@ -114,7 +114,7 @@ TOOL USAGE RULES:
 1. SEARCH INSTALLATIONS: Use 'search_installations' to find real installations from our database. This is a DATA tool — you receive the results and reason about them before responding.
 2. SHOW CASE STUDY: Use 'show_case_study' to display a rich case study card for a specific installation. Requires a nodeId (get it from search_installations first) or an application slug for auto-match.
 3. SAVINGS/ROI: Use 'energy_savings_calculator' when discussing costs, energy, ROI. If volume is missing, assume 500 kg/h and 16h/day.
-4. NAVIGATION: Use 'navigate_to_section' to move the user around the site.
+4. NAVIGATION: Use 'navigate_to_section' to move the user around the site. Two modes: (A) "section" for homepage scroll — valid IDs: "technology", "applications-dashboard", "applications-deep", "global", "our-story", "legacy". (B) "url" for cross-page navigation — e.g. url="/applications/textile-drying", url="/news", url="/heritage", url="/parts". ALWAYS use mode B for news, heritage, parts, and application detail pages.
 5. COMPARISONS: Use 'process_comparison_table' for RF vs conventional tech.
 6. EXPLAIN TECH: Use 'rf_technology_explainer' for physics/mechanism questions.
 7. APPLICATION KNOWLEDGE: Use 'get_application_knowledge' to retrieve deep technical theory, advantages, and datasheets from our knowledge base.
@@ -459,13 +459,39 @@ export async function POST(req: Request) {
         },
       }),
 
-      // ── TOOL 6: Navigate to Section (client-side — NO execute) ──
+      // ── TOOL 6: Navigate (client-side — NO execute) ──────────────
+      // Handles BOTH same-page scrolling (section) and cross-page
+      // routing (url). The client inspects which field is set.
       navigate_to_section: tool({
-        description: `Maps the user to a specific section of the FLUX website. Use when the user says "show me", "take me to", "where is", or asks about a specific page section. Available sections: "hero", "applications-dashboard", "applications-deep", "global" (globe), "timeline", "heritage", "news", "parts-catalog", "contact".`,
+        description: `Navigate the user to any part of the FLUX website.
+
+TWO MODES:
+A) SAME-PAGE SCROLL — set "section" to scroll to a homepage element by its DOM id:
+   "technology" (hero/intro), "applications-dashboard", "applications-deep", "global" (interactive globe), "our-story" (timeline), "legacy" (Patrizio legacy)
+   ONLY use these exact IDs. They only work when the user is on the homepage.
+
+B) CROSS-PAGE NAVIGATION — set "url" to a route path (WITHOUT locale prefix). The client adds the locale automatically:
+   "/news" — news hub listing
+   "/news/{slug}" — specific article (use a real slug from context)
+   "/heritage" — company heritage deep-dive
+   "/parts" — spare parts catalog (B2B portal)
+   "/applications/{slug}" — application detail page (use real slug from the database list above)
+
+RULES:
+- ALWAYS prefer mode B for news, heritage, parts, and application detail pages.
+- Only use mode A for scrolling within the homepage.
+- When using mode B, use application slugs from the database list in this prompt.
+- "show me textile drying" → url="/applications/textile-drying"
+- "take me to the news" → url="/news"
+- "show me the heritage" → url="/heritage"
+- "show me the spare parts" → url="/parts"
+- "show me the globe" → section="global"
+- "go to the top" → section="technology"`,
         inputSchema: z.object({
-          section: z.string().describe('Target section ID'),
+          section: z.string().optional().describe('Homepage element ID for same-page scroll'),
+          url: z.string().optional().describe('Route path for cross-page navigation (e.g. "/applications/textile-drying", "/news", "/heritage"). No locale prefix.'),
           subAction: z.enum(['none', 'activate-tab', 'highlight-node']).default('none'),
-          tabId: z.string().optional().describe('Application slug to activate'),
+          tabId: z.string().optional().describe('Application slug to activate on dashboard tab'),
           nodeId: z.string().optional().describe('Globe node ID to highlight'),
         }),
       }),

src/components/ai/SilentObserver.tsx

@@ -5,6 +5,7 @@ import { Sparkles, ArrowRight, X, Minus, Database, Maximize2, Minimize2 } from "
 import { useChat } from "@ai-sdk/react";
 import { DefaultChatTransport, lastAssistantMessageIsCompleteWithToolCalls } from "ai";
 import { useUIStore } from "@/lib/store/uiStore";
+import { useRouter, usePathname } from "next/navigation";
 import { useState, useEffect, useRef, useMemo } from "react";
 
 // ── Renderers ──
@@ -24,6 +25,10 @@ export default function SilentObserver() {
     setHighlightedMapNode, setSelectedMarkerId,
   } = useUIStore();
 
+  const router = useRouter();
+  const pathname = usePathname();
+  const locale = pathname?.split('/')[1] || 'en';
+
   const [input, setInput] = useState("");
   const [isDark, setIsDark] = useState(false);
   const [isWideMode, setIsWideMode] = useState(false);
@@ -68,10 +73,23 @@ export default function SilentObserver() {
       if (toolCall.dynamic) return;
 
       if (toolCall.toolName === "navigate_to_section") {
-        const { section, subAction, tabId, nodeId } = toolCall.input as {
+        const { section, url, subAction, tabId, nodeId } = toolCall.input as {
-          section: string; subAction?: string; tabId?: string; nodeId?: string;
+          section?: string; url?: string; subAction?: string; tabId?: string; nodeId?: string;
         };
         handleClose();
+
+        if (url) {
+          // Mode B: Cross-page navigation
+          setTimeout(() => {
+            router.push(`/${locale}${url}`);
+          }, 400);
+          addToolOutput({
+            tool: "navigate_to_section" as any,
+            toolCallId: toolCall.toolCallId,
+            output: `Navigated to page "${url}"`,
+          });
+        } else if (section) {
+          // Mode A: Same-page scroll (existing behavior)
           setTimeout(() => {
             const el = document.getElementById(section);
             if (el) el.scrollIntoView({ behavior: "smooth", block: "start" });
@@ -87,6 +105,7 @@ export default function SilentObserver() {
             output: `Navigated to "${section}" section${tabId ? `, activated tab "${tabId}"` : ""}${nodeId ? `, highlighted node "${nodeId}"` : ""}`,
           });
         }
+      }
     },
   });