feat: update component styles and add serial monitor functionality

frontend/public/components-metadata.json

@@ -1,6 +1,6 @@
 {
   "version": "1.0.0",
-  "generatedAt": "2026-03-06T02:57:38.515Z",
+  "generatedAt": "2026-03-06T13:12:51.254Z",
   "components": [
     {
       "id": "arduino-mega",

frontend/src/components/editor/EditorToolbar.tsx

@@ -136,7 +136,7 @@ export const EditorToolbar = ({ consoleOpen, setConsoleOpen, compileLogs: _compi
             className="tb-btn tb-btn-stop"
             title="Stop"
           >
-            <svg width="20" height="20" viewBox="0 0 24 24" fill="currentColor" stroke="none">
+            <svg width="22" height="22" viewBox="0 0 24 24" fill="currentColor" stroke="none">
               <rect x="3" y="3" width="18" height="18" rx="2" />
             </svg>
           </button>
@@ -195,7 +195,7 @@ export const EditorToolbar = ({ consoleOpen, setConsoleOpen, compileLogs: _compi
             className={`tb-btn tb-btn-output${consoleOpen ? ' tb-btn-output-active' : ''}`}
             title="Toggle Output Console"
           >
-            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+            <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
               <polyline points="4 17 10 11 4 5" />
               <line x1="12" y1="19" x2="20" y2="19" />
             </svg>

frontend/src/components/editor/FileExplorer.css

@@ -14,7 +14,8 @@
   display: flex;
   align-items: center;
   justify-content: space-between;
-  padding: 7px 10px 6px;
+  padding: 0 10px;
+  height: 46px;
   color: #9d9d9d;
   font-size: 11px;
   font-weight: 600;
@@ -23,20 +24,24 @@
   flex-shrink: 0;
 }
 
+.file-explorer-header-actions {
+  display: flex;
+  align-items: center;
+  gap: 2px;
+}
+
 .file-explorer-new-btn {
   background: none;
   border: none;
   color: #9d9d9d;
-  font-size: 18px;
-  line-height: 1;
   cursor: pointer;
-  padding: 0 3px;
+  padding: 2px;
   border-radius: 3px;
   display: flex;
   align-items: center;
   justify-content: center;
-  width: 22px;
+  width: 26px;
-  height: 22px;
+  height: 26px;
 }
 
 .file-explorer-new-btn:hover {
@@ -44,6 +49,25 @@
   color: #fff;
 }
 
+.file-explorer-save-btn {
+  background: none;
+  border: none;
+  color: #9d9d9d;
+  cursor: pointer;
+  padding: 2px;
+  border-radius: 3px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 26px;
+  height: 26px;
+}
+
+.file-explorer-save-btn:hover {
+  background: rgba(255, 255, 255, 0.08);
+  color: #4fc3f7;
+}
+
 .file-explorer-list {
   flex: 1;
   overflow-y: auto;
@@ -92,8 +116,10 @@
 }
 
 .file-explorer-dot {
-  color: #e8a87c;
+  width: 7px;
-  font-size: 9px;
+  height: 7px;
+  border-radius: 50%;
+  background: #e8a87c;
   flex-shrink: 0;
 }
 

frontend/src/components/editor/FileExplorer.tsx

@@ -2,13 +2,44 @@ import React, { useState, useRef, useEffect, useCallback } from 'react';
 import { useEditorStore } from '../../store/useEditorStore';
 import './FileExplorer.css';
 
-function getFileIcon(name: string): string {
+// SVG icons — same style as EditorToolbar (stroke-based, 16x16)
+const IcoFile = () => (
+  <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+    <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" />
+    <polyline points="14 2 14 8 20 8" />
+  </svg>
+);
+
+const IcoHeader = () => (
+  <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+    <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" />
+    <polyline points="14 2 14 8 20 8" />
+    <line x1="9" y1="13" x2="15" y2="13" />
+    <line x1="9" y1="17" x2="13" y2="17" />
+  </svg>
+);
+
+const IcoNewFile = () => (
+  <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+    <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" />
+    <polyline points="14 2 14 8 20 8" />
+    <line x1="12" y1="18" x2="12" y2="12" />
+    <line x1="9" y1="15" x2="15" y2="15" />
+  </svg>
+);
+
+const IcoSave = () => (
+  <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+    <path d="M19 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11l5 5v11a2 2 0 0 1-2 2z" />
+    <polyline points="17 21 17 13 7 13 7 21" />
+    <polyline points="7 3 7 8 15 8" />
+  </svg>
+);
+
+function FileIcon({ name }: { name: string }) {
   const ext = name.split('.').pop()?.toLowerCase() ?? '';
-  if (ext === 'ino') return '⚡';
+  if (['h', 'hpp'].includes(ext)) return <IcoHeader />;
-  if (['cpp', 'c', 'cc'].includes(ext)) return '📄';
+  return <IcoFile />;
-  if (['h', 'hpp'].includes(ext)) return '📋';
-  if (ext === 'json') return '{}';
-  return '📝';
 }
 
 interface ContextMenu {
@@ -17,7 +48,11 @@ interface ContextMenu {
   y: number;
 }
 
-export const FileExplorer: React.FC = () => {
+interface FileExplorerProps {
+  onSaveClick: () => void;
+}
+
+export const FileExplorer: React.FC<FileExplorerProps> = ({ onSaveClick }) => {
   const { files, activeFileId, openFile, createFile, deleteFile, renameFile } =
     useEditorStore();
   const [contextMenu, setContextMenu] = useState<ContextMenu | null>(null);
@@ -94,13 +129,22 @@ export const FileExplorer: React.FC = () => {
     <div className="file-explorer">
       <div className="file-explorer-header">
         <span className="file-explorer-title">WORKSPACE</span>
+        <div className="file-explorer-header-actions">
           <button
             className="file-explorer-new-btn"
             title="New File"
             onClick={startCreateFile}
           >
-          +
+            <IcoNewFile />
           </button>
+          <button
+            className="file-explorer-save-btn"
+            title="Save project (Ctrl+S)"
+            onClick={onSaveClick}
+          >
+            <IcoSave />
+          </button>
+        </div>
       </div>
 
       <div className="file-explorer-list">
@@ -113,7 +157,9 @@ export const FileExplorer: React.FC = () => {
             onDoubleClick={() => startRename(file.id)}
             title={`${file.name}${file.modified ? ' (unsaved)' : ''}`}
           >
-            <span className="file-explorer-icon">{getFileIcon(file.name)}</span>
+            <span className="file-explorer-icon">
+              <FileIcon name={file.name} />
+            </span>
 
             {renamingId === file.id ? (
               <input
@@ -133,16 +179,16 @@ export const FileExplorer: React.FC = () => {
             )}
 
             {file.modified && (
-              <span className="file-explorer-dot" title="Unsaved changes">
+              <span className="file-explorer-dot" title="Unsaved changes" />
-                ●
-              </span>
             )}
           </div>
         ))}
 
         {creatingFile && (
           <div className="file-explorer-item file-explorer-item-new">
-            <span className="file-explorer-icon">⚡</span>
+            <span className="file-explorer-icon">
+              <IcoFile />
+            </span>
             <input
               ref={newFileInputRef}
               className="file-explorer-rename-input"

frontend/src/components/editor/FileTabs.css

@@ -43,8 +43,10 @@
 }
 
 .file-tab-modified {
-  color: #e8a87c;
+  width: 7px;
-  font-size: 9px;
+  height: 7px;
+  border-radius: 50%;
+  background: #e8a87c;
   flex-shrink: 0;
 }
 

frontend/src/components/editor/FileTabs.tsx

@@ -39,7 +39,7 @@ export const FileTabs: React.FC = () => {
             onClick={() => setActiveFile(file.id)}
             title={file.name}
           >
-            {file.modified && <span className="file-tab-modified">●</span>}
+            {file.modified && <span className="file-tab-modified" title="Unsaved changes" />}
             <span className="file-tab-name">{file.name}</span>
             <button
               className="file-tab-close"

frontend/src/components/layout/AppHeader.tsx

@@ -1,15 +1,10 @@
 import { useState, useRef, useEffect } from 'react';
 import { Link, useNavigate } from 'react-router-dom';
 import { useAuthStore } from '../../store/useAuthStore';
-import { useSimulatorStore } from '../../store/useSimulatorStore';
 
-interface AppHeaderProps {
+interface AppHeaderProps {}
-  onSaveClick: () => void;
-}
 
-export const AppHeader: React.FC<AppHeaderProps> = ({ onSaveClick }) => {
+export const AppHeader: React.FC<AppHeaderProps> = () => {
-  const serialMonitorOpen = useSimulatorStore((s) => s.serialMonitorOpen);
-  const toggleSerialMonitor = useSimulatorStore((s) => s.toggleSerialMonitor);
   const user = useAuthStore((s) => s.user);
   const logout = useAuthStore((s) => s.logout);
   const navigate = useNavigate();
@@ -55,56 +50,6 @@ export const AppHeader: React.FC<AppHeaderProps> = ({ onSaveClick }) => {
           Examples
         </Link>
 
-        <button
-          onClick={toggleSerialMonitor}
-          className="serial-monitor-toggle"
-          title="Toggle Serial Monitor"
-          style={{
-            background: serialMonitorOpen ? '#0e639c' : 'transparent',
-            border: '1px solid #555',
-            color: '#ccc',
-            padding: '4px 10px',
-            borderRadius: 4,
-            cursor: 'pointer',
-            display: 'flex',
-            alignItems: 'center',
-            gap: 5,
-            fontSize: 13,
-          }}
-        >
-          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
-            <rect x="2" y="3" width="20" height="14" rx="2" />
-            <path d="M8 21h8M12 17v4" />
-          </svg>
-          Serial
-        </button>
-
-        {/* Save button */}
-        <button
-          onClick={onSaveClick}
-          title="Save project (Ctrl+S)"
-          style={{
-            background: '#0e639c',
-            border: 'none',
-            color: '#fff',
-            padding: '4px 12px',
-            borderRadius: 4,
-            cursor: 'pointer',
-            display: 'flex',
-            alignItems: 'center',
-            gap: 6,
-            fontSize: 13,
-            fontWeight: 500,
-          }}
-        >
-          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
-            <path d="M19 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11l5 5v11a2 2 0 0 1-2 2z" />
-            <polyline points="17 21 17 13 7 13 7 21" />
-            <polyline points="7 3 7 8 15 8" />
-          </svg>
-          Save
-        </button>
-
         {/* Auth UI */}
         {user ? (
           <div style={{ position: 'relative' }} ref={dropdownRef}>

frontend/src/components/simulator/SimulatorCanvas.css

@@ -85,6 +85,35 @@
   cursor: not-allowed;
 }
 
+/* ── Serial Monitor button ───────────────────────── */
+.canvas-serial-btn {
+  display: flex;
+  align-items: center;
+  gap: 5px;
+  padding: 0 10px;
+  height: 32px;
+  background: transparent;
+  border: 1px solid #3a4a5a;
+  border-radius: 5px;
+  color: #9d9d9d;
+  font-size: 12px;
+  font-weight: 500;
+  cursor: pointer;
+  transition: border-color 0.15s, background 0.15s, color 0.15s;
+  white-space: nowrap;
+}
+
+.canvas-serial-btn:hover {
+  border-color: #007acc;
+  color: #ccc;
+}
+
+.canvas-serial-btn-active {
+  background: #0e3a5a;
+  border-color: #007acc;
+  color: #4fc3f7;
+}
+
 /* ── Component count ─────────────────────────────── */
 .component-count {
   display: flex;

frontend/src/components/simulator/SimulatorCanvas.tsx

@@ -27,6 +27,8 @@ export const SimulatorCanvas = () => {
     addComponent,
     removeComponent,
     updateComponent,
+    serialMonitorOpen,
+    toggleSerialMonitor,
   } = useSimulatorStore();
 
   // Wire management from store
@@ -400,6 +402,19 @@ export const SimulatorCanvas = () => {
                 <option key={type} value={type}>{label}</option>
               ))}
             </select>
+
+            {/* Serial Monitor toggle */}
+            <button
+              onClick={toggleSerialMonitor}
+              className={`canvas-serial-btn${serialMonitorOpen ? ' canvas-serial-btn-active' : ''}`}
+              title="Toggle Serial Monitor"
+            >
+              <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+                <rect x="2" y="3" width="20" height="14" rx="2" />
+                <path d="M8 21h8M12 17v4" />
+              </svg>
+              Serial
+            </button>
           </div>
 
           <div className="canvas-header-right">
@@ -419,7 +434,7 @@ export const SimulatorCanvas = () => {
               title="Add Component"
               disabled={running}
             >
-              <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round">
+              <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round">
                 <line x1="12" y1="5" x2="12" y2="19" />
                 <line x1="5" y1="12" x2="19" y2="12" />
               </svg>

frontend/src/pages/EditorPage.tsx

@@ -112,7 +112,7 @@ export const EditorPage: React.FC = () => {
 
   return (
     <div className="app">
-      <AppHeader onSaveClick={handleSaveClick} />
+      <AppHeader />
 
       <div className="app-container" ref={containerRef}>
         {/* ── Editor side ── */}
@@ -121,7 +121,7 @@ export const EditorPage: React.FC = () => {
           style={{ width: `${editorWidthPct}%`, display: 'flex', flexDirection: 'row' }}
         >
           {/* File explorer sidebar */}
-          {explorerOpen && <FileExplorer />}
+          {explorerOpen && <FileExplorer onSaveClick={handleSaveClick} />}
 
           {/* Editor main area */}
           <div style={{ flex: 1, display: 'flex', flexDirection: 'column', overflow: 'hidden', minWidth: 0 }}>