[eric] onboarding: hovering a starter prompt shows a translucent ghost chat preview with the message as a user bubble

frontend/src/app/pages/Dashboard/canvas/DashboardEmptyState.tsx

@@ -72,6 +72,7 @@ const DashboardEmptyState: React.FC<{
   const navigate = useNavigate();
   const [launching, setLaunching] = React.useState(false);
   const [expanded, setExpanded] = React.useState<string | null>(null);
+  const [hoveredPrompt, setHoveredPrompt] = React.useState<string | null>(null);
   const currentCategory = STARTER_CATEGORIES.find((cat) => cat.id === expanded);
   const currentPrompts = currentCategory?.prompts ?? [];
 
@@ -193,12 +194,16 @@ const DashboardEmptyState: React.FC<{
                 >
                   <ArrowLeft size={15} /> back
                 </Box>
-                <Box sx={{ display: 'flex', flexDirection: 'column', gap: 0.9, width: '100%', maxWidth: 480 }}>
+                <Box
+                  onMouseLeave={() => setHoveredPrompt(null)}
+                  sx={{ position: 'relative', display: 'flex', flexDirection: 'column', gap: 0.9, width: '100%', maxWidth: 480 }}
+                >
                   {currentPrompts.map((prompt) => (
                     <Box
                       component="button"
                       key={prompt}
                       onClick={() => launch(prompt)}
+                      onMouseEnter={() => setHoveredPrompt(prompt)}
                       disabled={launching}
                       sx={{
                         textAlign: 'left',
@@ -218,6 +223,45 @@ const DashboardEmptyState: React.FC<{
                       {prompt}
                     </Box>
                   ))}
+
+                  {/* Hover preview: a translucent ghost of the chat that would open,
+                      so the user sees their message land before committing. Pure
+                      divs (not the heavy AgentChat), so it costs nothing to render. */}
+                  <AnimatePresence>
+                    {hoveredPrompt && (
+                      <Box
+                        component={motion.div}
+                        key="ghost"
+                        initial={{ opacity: 0, x: -8 }}
+                        animate={{ opacity: 0.72, x: 0 }}
+                        exit={{ opacity: 0, x: -8 }}
+                        transition={{ duration: 0.16 }}
+                        sx={{
+                          position: 'absolute',
+                          left: '100%', top: '50%', ml: 3,
+                          transform: 'translateY(-50%)',
+                          width: 300,
+                          pointerEvents: 'none',
+                          bgcolor: c.bg.surface,
+                          border: `1px solid ${c.border.medium}`,
+                          borderRadius: 3,
+                          boxShadow: c.shadow.md,
+                          p: 1.5,
+                        }}
+                      >
+                        <Typography sx={{ fontSize: '0.8rem', fontWeight: 600, color: c.text.tertiary, mb: 1.2 }}>
+                          New chat
+                        </Typography>
+                        <Box sx={{ display: 'flex', justifyContent: 'flex-end' }}>
+                          <Box sx={{ maxWidth: '88%', bgcolor: c.bg.elevated, borderRadius: 2.5, px: 1.4, py: 0.9 }}>
+                            <Typography sx={{ fontSize: '0.85rem', color: c.text.primary, lineHeight: 1.4 }}>
+                              {hoveredPrompt}
+                            </Typography>
+                          </Box>
+                        </Box>
+                      </Box>
+                    )}
+                  </AnimatePresence>
                 </Box>
               </motion.div>
             )}