US-017 completed

src/renderer/components/ai/AIChatPanel.tsx

@@ -0,0 +1,12 @@
+import { Sparkles } from 'lucide-react';
+
+export function AIChatPanel() {
+  return (
+    <div className="absolute inset-0 z-0 flex flex-col items-center justify-center bg-background">
+      <Sparkles size={32} className="text-muted-foreground/40 mb-3" />
+      <p className="text-sm text-muted-foreground/60 tracking-wide">
+        AI Chat — coming soon
+      </p>
+    </div>
+  );
+}

src/renderer/components/layout/AppShell.tsx

@@ -1,5 +1,6 @@
-import { useState } from 'react';
+import { useState, useEffect, useRef, useCallback } from 'react';
 import { Link, useRouterState } from '@tanstack/react-router';
+import { motion, useMotionValue, useSpring } from 'framer-motion';
 import {
   House,
   ChartGantt,
@@ -7,6 +8,7 @@ import {
   FolderKanban,
   PanelLeft,
   ChevronUp,
+  ChevronDown,
 } from 'lucide-react';
 import { trpc } from '@/lib/trpc';
 import {
@@ -23,6 +25,7 @@ import {
   SidebarProvider,
   useSidebar,
 } from '@/components/ui/sidebar';
+import { AIChatPanel } from '@/components/ai/AIChatPanel';
 
 const NAV_ITEMS = [
   { to: '/', icon: House, label: 'Home' },
@@ -35,6 +38,20 @@ interface AppShellProps {
   children: React.ReactNode;
 }
 
+/** Walk up the DOM to find the nearest scrollable ancestor. */
+function findScrollableAncestor(el: Element | null): Element | null {
+  if (!el || el === document.body) return null;
+  const style = window.getComputedStyle(el);
+  const overflowY = style.overflowY;
+  if (
+    (overflowY === 'auto' || overflowY === 'scroll') &&
+    el.scrollHeight > el.clientHeight
+  ) {
+    return el;
+  }
+  return findScrollableAncestor(el.parentElement);
+}
+
 export function AppShell({ children }: AppShellProps) {
   const collapsedQuery = trpc.settings.getSidebarCollapsed.useQuery(undefined, {
     staleTime: Infinity,
@@ -55,24 +72,105 @@ export function AppShell({ children }: AppShellProps) {
     setSidebarCollapsedMutation.mutate({ collapsed: !value });
   };
 
+  // Curtain is disabled on home page and on /projects without a selected project
+  const searchObj = routerState.location.search as Record<string, unknown>;
+  const curtainEnabled =
+    currentPath !== '/' &&
+    !(currentPath === '/projects' && !searchObj['projectId']);
+  const curtainEnabledRef = useRef(curtainEnabled);
+  curtainEnabledRef.current = curtainEnabled;
+
+  // --- Curtain animation state ---
+  const [curtainOpen, setCurtainOpen] = useState(false);
+  const curtainOpenRef = useRef(false);
+
+  const y = useMotionValue(0);
+  const springY = useSpring(y, { stiffness: 300, damping: 30 });
+
+  const openCurtain = useCallback(() => {
+    curtainOpenRef.current = true;
+    setCurtainOpen(true);
+    y.set(window.innerHeight);
+  }, [y]);
+
+  const closeCurtain = useCallback(() => {
+    curtainOpenRef.current = false;
+    setCurtainOpen(false);
+    y.set(0);
+  }, [y]);
+
+  const toggleCurtain = useCallback(() => {
+    if (curtainOpenRef.current) closeCurtain();
+    else openCurtain();
+  }, [openCurtain, closeCurtain]);
+
+  // Keyboard shortcut: Cmd/Ctrl+K
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === 'k' && (e.metaKey || e.ctrlKey)) {
+        e.preventDefault();
+        if (!curtainEnabledRef.current) return;
+        toggleCurtain();
+      }
+    };
+    document.addEventListener('keydown', handleKeyDown);
+    return () => document.removeEventListener('keydown', handleKeyDown);
+  }, [toggleCurtain]);
+
+  // Wheel event: overscroll detection
+  useEffect(() => {
+    const handleWheel = (e: WheelEvent) => {
+      if (!curtainOpenRef.current) {
+        if (!curtainEnabledRef.current) return;
+        // Opening: overscroll UP (deltaY < 0) when content is at top
+        if (e.deltaY < 0) {
+          const scrollable = findScrollableAncestor(e.target as Element);
+          const atTop = !scrollable || scrollable.scrollTop === 0;
+          if (atTop) openCurtain();
+        }
+      } else {
+        // Closing: scroll DOWN (deltaY > 0) while curtain is open
+        if (e.deltaY > 0) {
+          closeCurtain();
+        }
+      }
+    };
+
+    document.addEventListener('wheel', handleWheel, { passive: true });
+    return () => document.removeEventListener('wheel', handleWheel);
+  }, [openCurtain, closeCurtain]);
+
   return (
     <SidebarProvider open={open} onOpenChange={handleOpenChange}>
       <AppSidebar currentPath={currentPath} />
-      <SidebarInset>
-        {children}
+      <SidebarInset className="overflow-hidden">
+        {/* AI Chat layer: always mounted behind the content panel */}
+        <AIChatPanel />
 
-        {/* Right-edge vertical 'keep scrolling for AI' affordance (non-interactive) */}
-        <div className="absolute right-0 top-0 flex items-end justify-center pt-8 pointer-events-none select-none">
-          <div className="flex flex-col items-center gap-1.5 pr-2">
-            <ChevronUp size={10} className="text-muted-foreground/30" />
-            <span
-              className="text-[9px] text-muted-foreground/30 tracking-widest uppercase font-medium"
-              style={{ writingMode: 'vertical-rl', transform: 'rotate(180deg)' }}
-            >
-              scrolling up for Adiuva
-            </span>
+        {/* Content panel: slides down to reveal chat */}
+        <motion.div
+          style={{ y: springY }}
+          className="absolute inset-0 z-10 flex flex-col bg-background"
+        >
+          {children}
+
+          {/* Right-edge vertical affordance (non-interactive, hidden on home) */}
+          <div className={`absolute right-0 top-0 flex items-end justify-center pt-8 pointer-events-none select-none${!curtainEnabled ? ' hidden' : ''}`}>
+            <div className="flex flex-col items-center gap-1.5 pr-2">
+              {curtainOpen ? (
+                <ChevronDown size={10} className="text-muted-foreground/30" />
+              ) : (
+                <ChevronUp size={10} className="text-muted-foreground/30" />
+              )}
+              <span
+                className="text-[9px] text-muted-foreground/30 tracking-widest uppercase font-medium"
+                style={{ writingMode: 'vertical-rl', transform: 'rotate(180deg)' }}
+              >
+                {curtainOpen ? 'back to app' : 'scrolling up for Adiuva'}
+              </span>
+            </div>
           </div>
-        </div>
+        </motion.div>
       </SidebarInset>
     </SidebarProvider>
   );