[eric] ui: sidebar icons -> lucide line-glyphs (dashboard/apps/customize/settings/sidebar-toggle), springy hover

frontend/package-lock.json

@@ -23,6 +23,7 @@
         "codemirror": "^6.0.2",
         "framer-motion": "^12.35.2",
         "html-to-image": "^1.11.13",
+        "lucide-react": "^1.17.0",
         "react": "^18.2.0",
         "react-dom": "^18.2.0",
         "react-markdown": "^10.1.0",
@@ -6710,6 +6711,15 @@
         "yallist": "^3.0.2"
       }
     },
+    "node_modules/lucide-react": {
+      "version": "1.17.0",
+      "resolved": "https://registry.npmjs.org/lucide-react/-/lucide-react-1.17.0.tgz",
+      "integrity": "sha512-9FA9evdox/JQL5PT57fdA1x/yg8T7knJ98+zjTL3UfKza6pflQUUh3XtaQIHKvnsJw1lmsEyHVlt5jchYxOQ5w==",
+      "license": "ISC",
+      "peerDependencies": {
+        "react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/markdown-table": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/markdown-table/-/markdown-table-3.0.4.tgz",

frontend/package.json

@@ -24,6 +24,7 @@
     "codemirror": "^6.0.2",
     "framer-motion": "^12.35.2",
     "html-to-image": "^1.11.13",
+    "lucide-react": "^1.17.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-markdown": "^10.1.0",

frontend/src/app/components/Layout/AppShell.tsx

@@ -15,16 +15,16 @@ import Alert from '@mui/material/Alert';
 import InputBase from '@mui/material/InputBase';
 // One outlined icon language for the sidebar: thin monoline glyphs (not the
 // filled Material clip-art) so the rail reads as designed, not assembled.
-import DashboardIcon from '@mui/icons-material/SpaceDashboardOutlined';
+import { LayoutDashboard } from 'lucide-react';
 import PsychologyIcon from '@mui/icons-material/PsychologyOutlined';
 import BuildIcon from '@mui/icons-material/BuildOutlined';
 import TuneIcon from '@mui/icons-material/TuneOutlined';
-import ViewQuiltIcon from '@mui/icons-material/WidgetsOutlined';
+import { LayoutGrid } from 'lucide-react';
 import ExpandMoreIcon from '@mui/icons-material/ExpandMore';
 import AddIcon from '@mui/icons-material/Add';
-import SettingsIcon from '@mui/icons-material/SettingsOutlined';
-import ExtensionIcon from '@mui/icons-material/PaletteOutlined';
-import ViewSidebarOutlinedIcon from '@mui/icons-material/VerticalSplitOutlined';
+import { Settings as LucideSettings } from 'lucide-react';
+import { Palette } from 'lucide-react';
+import { PanelLeft } from 'lucide-react';
 import ArrowBackOutlinedIcon from '@mui/icons-material/ArrowBackOutlined';
 import ArrowForwardOutlinedIcon from '@mui/icons-material/ArrowForwardOutlined';
 import RestartAltIcon from '@mui/icons-material/RestartAlt';
@@ -398,7 +398,7 @@ const AppShell: React.FC = () => {
               '&:hover': { color: c.text.secondary, bgcolor: `${c.text.tertiary}14` },
             }}
           >
-            <ViewSidebarOutlinedIcon sx={{ fontSize: 18 }} />
+            <PanelLeft size={18} />
           </IconButton>
         </Tooltip>
         <Tooltip title="Back">
@@ -624,10 +624,10 @@ const AppShell: React.FC = () => {
           '&::-webkit-scrollbar': { width: 0 },
           // Tactile hover: the leading section icon springs once on row-hover, then settles.
           // Interaction-only, never ambient. Scoped to ListItemIcon so the +/chevron stay put.
-          '& .MuiListItemIcon-root .MuiSvgIcon-root': {
+          '& .MuiListItemIcon-root svg': {
             transition: 'transform 0.18s cubic-bezier(0.34, 1.56, 0.64, 1)',
           },
-          '& .MuiListItemButton-root:hover .MuiListItemIcon-root .MuiSvgIcon-root': {
+          '& .MuiListItemButton-root:hover .MuiListItemIcon-root svg': {
             transform: 'scale(1.15)',
           },
         }}>
@@ -648,7 +648,7 @@ const AppShell: React.FC = () => {
               }}
             >
               <ListItemIcon sx={{ color: isDashboardRoute ? c.accent.primary : c.text.tertiary, minWidth: 28 }}>
-                <DashboardIcon sx={{ fontSize: 18 }} />
+                <LayoutDashboard size={18} />
               </ListItemIcon>
               <ListItemText
                 primary="Dashboards"
@@ -810,7 +810,7 @@ const AppShell: React.FC = () => {
               }}
             >
               <ListItemIcon sx={{ color: isCustomizationRoute ? c.accent.primary : c.text.tertiary, minWidth: 28 }}>
-                <ExtensionIcon sx={{ fontSize: 18 }} />
+                <Palette size={18} />
               </ListItemIcon>
               <ListItemText
                 primary="Customization"
@@ -905,7 +905,7 @@ const AppShell: React.FC = () => {
               }}
             >
               <ListItemIcon sx={{ color: isAppsRoute ? c.accent.primary : c.text.tertiary, minWidth: 28 }}>
-                <ViewQuiltIcon sx={{ fontSize: 18 }} />
+                <LayoutGrid size={18} />
               </ListItemIcon>
               <ListItemText
                 primary="Apps"
@@ -1021,7 +1021,7 @@ const AppShell: React.FC = () => {
             }}
           >
             <ListItemIcon sx={{ color: c.text.tertiary, minWidth: 28, position: 'relative' }}>
-              <SettingsIcon sx={{ fontSize: 18 }} />
+              <LucideSettings size={18} />
               {showUpdateDot && (
                 <Box
                   sx={{