diff --git a/src/main/index.ts b/src/main/index.ts
index bc5e8ca..a236243 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -3,7 +3,7 @@ import type { WebContents } from 'electron'
 import { spawn, type ChildProcessWithoutNullStreams } from 'child_process'
 import * as pty from 'node-pty'
 import type { IPty } from 'node-pty'
-import { createWriteStream, existsSync } from 'fs'
+import { appendFileSync, createWriteStream, existsSync, mkdirSync } from 'fs'
 import { cp, mkdir, readdir, readFile, rename, rm, stat, writeFile } from 'fs/promises'
 import { homedir } from 'os'
 import { basename, dirname, join, relative, resolve } from 'path'
@@ -33,6 +33,20 @@ const slamSimulationRuntimeImage = 'nav2-slam:humble'
 const slamSimulationRuntimeContainerName = 'nav2-slam'
 const rosBridgePort = 8765
 const exampleCodeRoot = resolve(homedir(), '다운로드', 'example-code')
+
+function writeRendererDiagnostic(kind: string, message: string): void {
+  try {
+    const logDirectory = app.getPath('logs')
+    mkdirSync(logDirectory, { recursive: true })
+    appendFileSync(
+      join(logDirectory, 'renderer.log'),
+      `[${new Date().toISOString()}] [${kind}] ${message}\n`,
+      'utf8',
+    )
+  } catch {
+    // Diagnostics must never interrupt the LMS window itself.
+  }
+}
 const skippedCacheDirs = new Set(['.git', 'build', 'install', 'log', 'node_modules', 'docker'])
 const textFilePattern = /\.(c|cc|cpp|cxx|h|hpp|hh|py|xml|urdf|xacro|yaml|yml|json|txt|md|cmake|launch|sh|bash|toml|ini|cfg|rviz)$/i
 const imageFilePattern = /\.(png|jpe?g|webp|gif|svg)$/i
@@ -4035,6 +4049,9 @@ function registerTerminalHandlers(): void {
 
 if (process.platform === 'linux' && !is.dev) {
   app.commandLine.appendSwitch('no-sandbox')
+  // Some packaged LMS launches run with an inaccessible /dev/shm. Keep Chromium
+  // shared-memory files under the app temp directory so DevTools can open.
+  app.commandLine.appendSwitch('disable-dev-shm-usage')
   app.commandLine.appendSwitch('ignore-gpu-blocklist')
   app.commandLine.appendSwitch('enable-unsafe-swiftshader')
 }
@@ -4044,7 +4061,8 @@ function attachDevToolsShortcut(win: BrowserWindow): void {
     if (input.type !== 'keyDown') return
     const key = input.key.toLowerCase()
     const code = input.code.toLowerCase()
-    if (input.key === 'F12' || code === 'f12' || ((input.control || input.meta) && input.shift && key === 'i')) {
+    // Some Linux keyboard layouts report the physical F12 key as Help.
+    if (input.key === 'F12' || key === 'help' || code === 'f12' || code === 'help' || ((input.control || input.meta) && input.shift && key === 'i')) {
       event.preventDefault()
       win.webContents.toggleDevTools()
     }
@@ -4174,6 +4192,19 @@ function createWindow(): void {
 
   attachDevToolsShortcut(mainWindow)
   suppressSystemContextMenu(mainWindow)
+  mainWindow.webContents.on('console-message', (_event, level, message, line, sourceId) => {
+    if (level < 2) return
+    writeRendererDiagnostic('console', `${sourceId}:${line} [level=${level}] ${message}`)
+  })
+  mainWindow.webContents.on('did-fail-load', (_event, errorCode, errorDescription, validatedURL, isMainFrame) => {
+    writeRendererDiagnostic(
+      'load-failed',
+      `${isMainFrame ? 'main-frame' : 'sub-frame'} code=${errorCode} url=${validatedURL} message=${errorDescription}`,
+    )
+  })
+  mainWindow.webContents.on('render-process-gone', (_event, details) => {
+    writeRendererDiagnostic('renderer-gone', `reason=${details.reason} exitCode=${details.exitCode}`)
+  })
   mainWindow.once('ready-to-show', () => {
     setTimeout(() => {
       updateSplashStatus('로그인 세션 확인 중...')
@@ -4396,6 +4427,15 @@ app.whenReady().then(() => {
     if (!target) return
     target.isMaximized() ? target.unmaximize() : target.maximize()
   })
+  ipcMain.handle('titlebar-open-devtools', (event) => {
+    const target = BrowserWindow.fromWebContents(event.sender)
+    if (!target || target.isDestroyed()) return { opened: false, message: 'LMS 창을 찾지 못했습니다.' }
+    target.show()
+    target.focus()
+    target.webContents.openDevTools({ mode: 'detach', activate: true })
+    setImmediate(() => target.webContents.devToolsWebContents?.focus())
+    return { opened: true }
+  })
   ipcMain.on('titlebar-close', (event) => BrowserWindow.fromWebContents(event.sender)?.close())
   ipcMain.on('app-quit', () => app.quit())
   ipcMain.handle('learning-video:open', (event, input: LearningVideoInput) => openLearningVideoWindow(BrowserWindow.fromWebContents(event.sender), input))
diff --git a/src/preload/index.ts b/src/preload/index.ts
index 25633e1..0f7b5eb 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -91,6 +91,7 @@ contextBridge.exposeInMainWorld('lmsBootSplash', {
 contextBridge.exposeInMainWorld('titlebar', {
   minimize: () => ipcRenderer.send('titlebar-minimize'),
   maximize: () => ipcRenderer.send('titlebar-maximize'),
+  openDevTools: () => ipcRenderer.invoke('titlebar-open-devtools'),
   close: () => ipcRenderer.send('titlebar-close')
 })
 contextBridge.exposeInMainWorld('appLifecycle', {
diff --git a/src/renderer/public/slam-viewer/index.html b/src/renderer/public/slam-viewer/index.html
index 980bde4..9ed7cab 100644
--- a/src/renderer/public/slam-viewer/index.html
+++ b/src/renderer/public/slam-viewer/index.html
@@ -153,6 +153,11 @@
 	      align-items:center;
 	      gap:6px;
 	    }
+	    #splatToggle {
+	      display:inline-flex;
+	      align-items:center;
+	      justify-content:center;
+	    }
 	    #cameraPresetSelect {
 	      min-width:86px;
 	      padding:0 24px 0 9px;
@@ -292,8 +297,8 @@
 	<script type="importmap">
 {
 	  "imports": {
-	    "three": "/vendor/three/build/three.module.js",
-	    "three/addons/": "/vendor/three/examples/jsm/",
+	    "three": "../vendor/three/build/three.module.js",
+	    "three/addons/": "../vendor/three/examples/jsm/",
     "@mkkellogg/gaussian-splats-3d": "./vendor/gaussian-splats-3d.module.js"
 	  }
 	}
@@ -977,7 +982,7 @@ async function loadMkMiniModel(sdfPose = { x:0, y:0, z:0, roll:0, pitch:0, yaw:0
   const initialBounds = new THREE.Box3().setFromObject(model);
   const initialSize = initialBounds.getSize(new THREE.Vector3());
   const largestDimension = Math.max(initialSize.x, initialSize.y, initialSize.z, 0.001);
-  model.scale.setScalar(0.62 / largestDimension);
+  model.scale.setScalar(0.66 / largestDimension);
   model.updateMatrixWorld(true);
 
   const normalizedBounds = new THREE.Box3().setFromObject(model);
diff --git a/src/renderer/src/App.tsx b/src/renderer/src/App.tsx
index 39b3fd7..dffcff1 100644
--- a/src/renderer/src/App.tsx
+++ b/src/renderer/src/App.tsx
@@ -3234,6 +3234,7 @@ export default function App(): React.JSX.Element {
   const connectedPlatformRef = useRef<PlatformOption | null>(null)
   const runningPlatformsRef = useRef<PlatformOption[]>([])
   const platformStatusRequestSequenceRef = useRef(0)
+  const [checkedRemotePlatformStatusIds, setCheckedRemotePlatformStatusIds] = useState<Set<string>>(() => new Set())
   const forcedPlatformTerminationHandlerRef = useRef<(payload: PlatformControlTerminatedPayload) => void>(() => undefined)
   const [workspaceWeekState, setWorkspaceWeekState] = useState<CurriculumWeek | null>(null)
   const [sessionConfirmAction, setSessionConfirmAction] = useState<'disconnect' | 'release' | null>(null)
@@ -3641,6 +3642,11 @@ export default function App(): React.JSX.Element {
           return status ? { ...platform, ...status } : platform
         }
         setPlatformOptions((current) => current.map(mergePlatformStatus))
+        setCheckedRemotePlatformStatusIds((current) => {
+          const next = new Set(current)
+          platforms.forEach((platform) => next.add(platform.id))
+          return next
+        })
         const lostControlPlatformIds = new Set(
           runningPlatformsRef.current
             .filter((platform) => {
@@ -3813,15 +3819,19 @@ export default function App(): React.JSX.Element {
       cancelled = true
     }
   }, [authReady, authSession?.accessToken, fetchWithFreshAuth])
+  const isRemotePlatformStatusPending = (platform: PlatformOption): boolean => (
+    platform.platformKey !== 'futuredrive-local-pc' && !checkedRemotePlatformStatusIds.has(platform.id)
+  )
   const filteredPlatformOptions = platformOptions.filter((platform) => {
-    if (platformFilter === 'available') return platform.state === 'ready'
-    if (platformFilter === 'unavailable') return platform.state !== 'ready'
+    const pending = isRemotePlatformStatusPending(platform)
+    if (platformFilter === 'available') return platform.state === 'ready' && !pending
+    if (platformFilter === 'unavailable') return platform.state !== 'ready' && !pending
     return true
   })
   const platformFilterCounts = {
     all: platformOptions.length,
-    available: platformOptions.filter((platform) => platform.state === 'ready').length,
-    unavailable: platformOptions.filter((platform) => platform.state !== 'ready').length
+    available: platformOptions.filter((platform) => platform.state === 'ready' && !isRemotePlatformStatusPending(platform)).length,
+    unavailable: platformOptions.filter((platform) => platform.state !== 'ready' && !isRemotePlatformStatusPending(platform)).length
   }
   const localPcPlatform = platformOptions.find((platform) => platform.platformKey === 'futuredrive-local-pc')
   const openPlatformSettings = (platform: PlatformOption): void => {
@@ -4306,6 +4316,8 @@ export default function App(): React.JSX.Element {
     setLocalPcLayoutOpen(false)
     setRecentSessionModalOpen(false)
     setPlatformModalMode('select')
+    platformStatusRequestSequenceRef.current += 1
+    setCheckedRemotePlatformStatusIds(new Set())
     await loadCurriculum()
     setPlatformModalOpen(true)
   }
@@ -4828,6 +4840,7 @@ export default function App(): React.JSX.Element {
                     counts={platformFilterCounts}
                     workspaceWeekTitle={workspaceWeek.title}
                     platformLoading={platformLoading}
+                    checkedRemotePlatformStatusIds={checkedRemotePlatformStatusIds}
                     isPlatformUnavailable={isPlatformUnavailable}
                     getPlatformDotClass={getPlatformDotClass}
                     onFilterChange={setPlatformFilter}
diff --git a/src/renderer/src/components/TitleBar.tsx b/src/renderer/src/components/TitleBar.tsx
index 974ab99..8f4ec29 100644
--- a/src/renderer/src/components/TitleBar.tsx
+++ b/src/renderer/src/components/TitleBar.tsx
@@ -1,5 +1,5 @@
 import icon from '/assets/icon.png'
-import { Bell, BookOpen, Building2, CheckCheck, ChevronLeft, ChevronRight, HelpCircle, LogOut, Minus, Search, Square, X } from 'lucide-react'
+import { Bell, BookOpen, Bug, Building2, CheckCheck, ChevronLeft, ChevronRight, HelpCircle, LogOut, Minus, Search, Square, X } from 'lucide-react'
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import Tooltip from './Tooltip'
 
@@ -495,6 +495,20 @@ export default function TitleBar({ user, accessToken = '', onHelpClick, onOpenCo
             <HelpCircle size={16} />
           </button>
         </Tooltip>
+        <Tooltip label="개발자 도구 열기">
+          <button
+            type="button"
+            aria-label="Open Developer Tools"
+            onClick={() => {
+              void window.titlebar.openDevTools().then((result) => {
+                if (!result.opened) console.error('[titlebar] open DevTools failed:', result.message)
+              }).catch((error) => console.error('[titlebar] open DevTools request failed:', error))
+            }}
+            className={winButton}
+          >
+            <Bug size={15} />
+          </button>
+        </Tooltip>
         <div className="relative" ref={notificationRef}>
           <Tooltip label="알림" disabled={notificationOpen}>
             <button
diff --git a/src/renderer/src/env.d.ts b/src/renderer/src/env.d.ts
index a301d30..1343e93 100644
--- a/src/renderer/src/env.d.ts
+++ b/src/renderer/src/env.d.ts
@@ -44,6 +44,7 @@ interface Window {
   titlebar: {
     minimize: () => void
     maximize: () => void
+    openDevTools: () => Promise<{ opened: boolean; message?: string }>
     close: () => void
   }
   appLifecycle: {
diff --git a/src/renderer/src/features/platforms/PlatformCards.tsx b/src/renderer/src/features/platforms/PlatformCards.tsx
index 0f98c46..09c9d78 100644
--- a/src/renderer/src/features/platforms/PlatformCards.tsx
+++ b/src/renderer/src/features/platforms/PlatformCards.tsx
@@ -1,4 +1,4 @@
-import { AlertCircle, CheckCircle2, Link2, Lock, Power, Settings } from 'lucide-react'
+import { AlertCircle, CheckCircle2, Link2, LoaderCircle, Lock, Power, Settings } from 'lucide-react'
 import type { LucideIcon } from 'lucide-react'
 import type React from 'react'
 import type { PlatformOption } from './types'
@@ -60,6 +60,7 @@ type PlatformOptionCardProps = {
   Icon: LucideIcon
   dotClassName: string
   unavailable: boolean
+  statusPending: boolean
   displayStatus: string
   primaryAction: string
   actionDisabled: boolean
@@ -73,6 +74,7 @@ export function PlatformOptionCard({
   Icon,
   dotClassName,
   unavailable,
+  statusPending,
   displayStatus,
   primaryAction,
   actionDisabled,
@@ -106,7 +108,9 @@ export function PlatformOptionCard({
         </div>
         <p className="mt-1 text-[12px] font-medium text-[#5f6878]">{platform.description}</p>
         <div className="mt-2 flex items-center gap-1.5 text-[11px] font-bold text-[#5f6878]">
-          {unavailable
+          {statusPending
+            ? <LoaderCircle size={13} className="animate-spin text-[#7a879a]" />
+            : unavailable
             ? <AlertCircle size={13} className="text-[#dc2626]" />
             : ready
                 ? <CheckCircle2 size={13} className="text-[#2fbda0]" />
diff --git a/src/renderer/src/features/platforms/PlatformSelectionPanel.tsx b/src/renderer/src/features/platforms/PlatformSelectionPanel.tsx
index 2ca883d..40441d6 100644
--- a/src/renderer/src/features/platforms/PlatformSelectionPanel.tsx
+++ b/src/renderer/src/features/platforms/PlatformSelectionPanel.tsx
@@ -19,6 +19,7 @@ type PlatformSelectionPanelProps = {
   counts: Record<PlatformFilter, number>
   workspaceWeekTitle: string
   platformLoading: boolean
+  checkedRemotePlatformStatusIds: ReadonlySet<string>
   isPlatformUnavailable: (platform: PlatformOption) => boolean
   getPlatformDotClass: (platform: PlatformOption) => string
   onFilterChange: (filter: PlatformFilter) => void
@@ -36,6 +37,7 @@ export default function PlatformSelectionPanel({
   counts,
   workspaceWeekTitle,
   platformLoading,
+  checkedRemotePlatformStatusIds,
   isPlatformUnavailable,
   getPlatformDotClass,
   onFilterChange,
@@ -81,14 +83,17 @@ export default function PlatformSelectionPanel({
           const { id, status, action, state, iconKey } = platform
           const Icon = PLATFORM_ICONS[iconKey] ?? Monitor
           const locked = state === 'locked'
-          const unavailable = isPlatformUnavailable(platform)
-          const actionDisabled = locked || unavailable
+          const statusPending = platform.platformKey !== 'futuredrive-local-pc' && !checkedRemotePlatformStatusIds.has(id)
+          const unavailable = !statusPending && isPlatformUnavailable(platform)
+          const actionDisabled = statusPending || locked || unavailable
           const runningInSelectionList = runningPlatforms.some((runningPlatform) => runningPlatform.id === platform.id)
-          const displayStatus = unavailable && !status.includes('연결 끊김') && !status.includes('연결 불가')
+          const displayStatus = statusPending
+            ? '확인 중'
+            : unavailable && !status.includes('연결 끊김') && !status.includes('연결 불가')
             ? '연결 끊김'
             : status
           const hasControl = platform.control?.status === 'ACTIVE'
-          const primaryAction = hasControl ? '연결' : action
+          const primaryAction = statusPending ? '확인 중' : hasControl ? '연결' : action
           const platformActionDisabled = runningInSelectionList || actionDisabled
 
           return (
@@ -96,8 +101,9 @@ export default function PlatformSelectionPanel({
               key={id}
               platform={platform}
               Icon={Icon}
-              dotClassName={getPlatformDotClass(platform)}
+              dotClassName={statusPending ? 'bg-[#94a3b8] shadow-[0_0_6px_rgba(148,163,184,0.45)]' : getPlatformDotClass(platform)}
               unavailable={unavailable}
+              statusPending={statusPending}
               displayStatus={displayStatus}
               primaryAction={primaryAction}
               actionDisabled={platformActionDisabled}
diff --git a/src/renderer/src/features/workspace/WorldEditorModal.tsx b/src/renderer/src/features/workspace/WorldEditorModal.tsx
index 9f842f0..1aeda49 100644
--- a/src/renderer/src/features/workspace/WorldEditorModal.tsx
+++ b/src/renderer/src/features/workspace/WorldEditorModal.tsx
@@ -59,11 +59,11 @@ function createMesh(item: WorldLayoutObject): THREE.Mesh {
   return mesh
 }
 
-const modelRoot = '/slam-viewer/turtlebot3_world_model/turtlebot3_world'
+const modelRoot = './slam-viewer/turtlebot3_world_model/turtlebot3_world'
 const modelRoots: Record<string, string> = {
   turtlebot3_world: modelRoot,
-  turtlebot3_house: '/slam-viewer/turtlebot3_world_model/turtlebot3_house',
-  turtlebot3_common: '/slam-viewer/turtlebot3_world_model/turtlebot3_common'
+  turtlebot3_house: './slam-viewer/turtlebot3_world_model/turtlebot3_house',
+  turtlebot3_common: './slam-viewer/turtlebot3_world_model/turtlebot3_common'
 }
 
 function parseNumbers(value: string | null | undefined, count = 0): number[] {
@@ -97,7 +97,7 @@ function worldMaterial(visual: Element): THREE.MeshLambertMaterial {
 }
 
 function gazeboAssetPath(uri: string): string {
-  return uri.replace(/^model:\/\/(\w+)\//, (_match, name: string) => `${modelRoots[name] ?? `/slam-viewer/turtlebot3_world_model/${name}`}/`)
+  return uri.replace(/^model:\/\/(\w+)\//, (_match, name: string) => `${modelRoots[name] ?? `./slam-viewer/turtlebot3_world_model/${name}`}/`)
 }
 
 async function loadWorldSdf(parent: THREE.Group): Promise<void> {
@@ -470,7 +470,7 @@ export default function WorldEditorModal({ workspaceRoot, onClose, onSaved }: Wo
           </aside>
           <main className="relative min-w-0 flex-1 bg-[#0b1220]">
             <div ref={canvasHostRef} className="pointer-events-none absolute inset-0 opacity-0" />
-            <iframe ref={viewerRef} title="TurtleBot3 World Editor" src="/slam-viewer/index.html?editor=1&mapKey=nav2-custom" className="absolute inset-0 z-10 size-full border-0" />
+            <iframe ref={viewerRef} title="TurtleBot3 World Editor" src="./slam-viewer/index.html?editor=1&mapKey=nav2-custom" className="absolute inset-0 z-10 size-full border-0" />
             {loading && <div className="absolute inset-0 z-20 grid place-items-center bg-[#0b1220] text-[12px] font-semibold text-white/58"><span className="flex items-center gap-2"><LoaderCircle size={16} className="animate-spin" />월드 불러오는 중</span></div>}
             <div className="absolute left-3 top-3 z-20 flex overflow-hidden rounded-md border border-white/15 bg-[#15223a]/95 shadow">
               {([
diff --git a/src/renderer/src/features/workspace/useWorkspaceVisualization.ts b/src/renderer/src/features/workspace/useWorkspaceVisualization.ts
index 1e66eec..7f86ccb 100644
--- a/src/renderer/src/features/workspace/useWorkspaceVisualization.ts
+++ b/src/renderer/src/features/workspace/useWorkspaceVisualization.ts
@@ -134,8 +134,8 @@ export function useWorkspaceVisualization({
   const visualizationRuntimeStack = visualizationStack === 'slam' || visualizationStack === 'slam3d' ? 'nav2' : visualizationStack
   const pointCloudQuery = visualizationStack === 'slam3d' ? '&pointCloud=1' : ''
   const visualizationViewerUrl = visualizationStack === 'slam' || visualizationStack === 'slam3d' || visualizationStack === 'nav2'
-    ? `/slam-viewer/index.html?directBridge=1&mode=${visualizationStack === 'nav2' ? nav2VisualizationMode : 'slam'}&runtime=${isRealPlatformProfile(activeEnvironmentProfile) ? 'real' : 'simulation'}&bridgeWs=${encodeURIComponent(`${visualizationBridgeUrl}/ws/state`)}&bridgeHttp=${encodeURIComponent(visualizationBridgeHttpUrl)}&mapKey=${encodeURIComponent(mapKey ?? 'nav2-turtlebot3-world')}&layoutVersion=${worldLayoutVersion ?? 0}${pointCloudQuery}`
-    : `/autoware-viewer/index.html?source=ros&stack=${visualizationStack}&bridge=${encodeURIComponent(visualizationBridgeUrl)}&backend=${encodeURIComponent(visualizationBackendUrl)}`
+    ? `./slam-viewer/index.html?directBridge=1&mode=${visualizationStack === 'nav2' ? nav2VisualizationMode : 'slam'}&runtime=${isRealPlatformProfile(activeEnvironmentProfile) ? 'real' : 'simulation'}&bridgeWs=${encodeURIComponent(`${visualizationBridgeUrl}/ws/state`)}&bridgeHttp=${encodeURIComponent(visualizationBridgeHttpUrl)}&mapKey=${encodeURIComponent(mapKey ?? 'nav2-turtlebot3-world')}&layoutVersion=${worldLayoutVersion ?? 0}${pointCloudQuery}`
+    : `./autoware-viewer/index.html?source=ros&stack=${visualizationStack}&bridge=${encodeURIComponent(visualizationBridgeUrl)}&backend=${encodeURIComponent(visualizationBackendUrl)}`
 
   useEffect(() => {
     const fallback = runtimeProfiles[0] ? resolveVisualizationStack(runtimeProfiles[0].profileType) : null