feat: Adjust UI for mobile res

Feature:
- Adjust homecreen and chatscreen for mobile device
- Fix tests for both FE and BE
Self-test:
- Confirm runnable on both Android and iOS
- Confirm runnable on desktop app
- All test suites passed
- Working with ChatGPT API

src-tauri/plugins/tauri-plugin-hardware/src/vendor/tests.rs

@@ -19,3 +19,115 @@ fn test_get_vulkan_gpus() {
         println!("    {:?}", gpu.get_usage());
     }
 }
+
+#[cfg(not(any(target_os = "android", target_os = "ios")))]
+#[test]
+fn test_get_vulkan_gpus_on_desktop() {
+    let gpus = vulkan::get_vulkan_gpus("");
+
+    // Test that function returns without panicking on desktop platforms
+    assert!(gpus.len() >= 0);
+
+    // If GPUs are found, verify they have valid properties
+    for (i, gpu) in gpus.iter().enumerate() {
+        println!("Desktop GPU {}:", i);
+        println!("    Name: {}", gpu.name);
+        println!("    Vendor: {:?}", gpu.vendor);
+        println!("    Total Memory: {} MB", gpu.total_memory);
+        println!("    UUID: {}", gpu.uuid);
+        println!("    Driver Version: {}", gpu.driver_version);
+
+        // Verify that GPU properties are not empty/default values
+        assert!(!gpu.name.is_empty(), "GPU name should not be empty");
+        assert!(!gpu.uuid.is_empty(), "GPU UUID should not be empty");
+
+        // Test vulkan-specific info is present
+        if let Some(vulkan_info) = &gpu.vulkan_info {
+            println!("    Vulkan API Version: {}", vulkan_info.api_version);
+            println!("    Device Type: {}", vulkan_info.device_type);
+            assert!(!vulkan_info.api_version.is_empty(), "Vulkan API version should not be empty");
+            assert!(!vulkan_info.device_type.is_empty(), "Device type should not be empty");
+        }
+    }
+}
+
+#[cfg(target_os = "android")]
+#[test]
+fn test_get_vulkan_gpus_on_android() {
+    let gpus = vulkan::get_vulkan_gpus("");
+
+    // Test that function returns without panicking on Android
+    assert!(gpus.len() >= 0);
+
+    // Android-specific validation
+    for (i, gpu) in gpus.iter().enumerate() {
+        println!("Android GPU {}:", i);
+        println!("    Name: {}", gpu.name);
+        println!("    Vendor: {:?}", gpu.vendor);
+        println!("    Total Memory: {} MB", gpu.total_memory);
+        println!("    UUID: {}", gpu.uuid);
+        println!("    Driver Version: {}", gpu.driver_version);
+
+        // Verify C string parsing works correctly with i8 on Android
+        assert!(!gpu.name.is_empty(), "GPU name should not be empty on Android");
+        assert!(!gpu.uuid.is_empty(), "GPU UUID should not be empty on Android");
+
+        // Android devices should typically have Adreno, Mali, or PowerVR GPUs
+        // The name parsing should handle i8 char arrays correctly
+        assert!(
+            gpu.name.chars().all(|c| c.is_ascii() || c.is_ascii_control()),
+            "GPU name should contain valid characters when parsed from i8 array"
+        );
+
+        if let Some(vulkan_info) = &gpu.vulkan_info {
+            println!("    Vulkan API Version: {}", vulkan_info.api_version);
+            println!("    Device Type: {}", vulkan_info.device_type);
+            // Verify API version parsing works with Android's i8 char arrays
+            assert!(
+                vulkan_info.api_version.matches('.').count() >= 2,
+                "API version should be in format X.Y.Z"
+            );
+        }
+    }
+}
+
+#[cfg(target_os = "ios")]
+#[test]
+fn test_get_vulkan_gpus_on_ios() {
+    let gpus = vulkan::get_vulkan_gpus("");
+
+    // Note: iOS doesn't support Vulkan natively, so this might return empty
+    // But the function should still work without crashing
+    assert!(gpus.len() >= 0);
+
+    // iOS-specific validation (if any Vulkan implementation is available via MoltenVK)
+    for (i, gpu) in gpus.iter().enumerate() {
+        println!("iOS GPU {}:", i);
+        println!("    Name: {}", gpu.name);
+        println!("    Vendor: {:?}", gpu.vendor);
+        println!("    Total Memory: {} MB", gpu.total_memory);
+        println!("    UUID: {}", gpu.uuid);
+        println!("    Driver Version: {}", gpu.driver_version);
+
+        // Verify C string parsing works correctly with i8 on iOS
+        assert!(!gpu.name.is_empty(), "GPU name should not be empty on iOS");
+        assert!(!gpu.uuid.is_empty(), "GPU UUID should not be empty on iOS");
+
+        // iOS devices should typically have Apple GPU (if Vulkan is available via MoltenVK)
+        // The name parsing should handle i8 char arrays correctly
+        assert!(
+            gpu.name.chars().all(|c| c.is_ascii() || c.is_ascii_control()),
+            "GPU name should contain valid characters when parsed from i8 array"
+        );
+
+        if let Some(vulkan_info) = &gpu.vulkan_info {
+            println!("    Vulkan API Version: {}", vulkan_info.api_version);
+            println!("    Device Type: {}", vulkan_info.device_type);
+            // Verify API version parsing works with iOS's i8 char arrays
+            assert!(
+                vulkan_info.api_version.matches('.').count() >= 2,
+                "API version should be in format X.Y.Z"
+            );
+        }
+    }
+}

src-tauri/src/core/threads/commands.rs

@@ -127,7 +127,6 @@ pub async fn create_message<R: Runtime>(
             .ok_or("Missing thread_id")?;
         id.to_string()
     };
-    ensure_thread_dir_exists(app_handle.clone(), &thread_id)?;
     let path = get_messages_path(app_handle.clone(), &thread_id);
 
     if message.get("id").is_none() {
@@ -140,6 +139,9 @@ pub async fn create_message<R: Runtime>(
         let lock = get_lock_for_thread(&thread_id).await;
         let _guard = lock.lock().await;
 
+        // Ensure directory exists right before file operations to handle race conditions
+        ensure_thread_dir_exists(app_handle.clone(), &thread_id)?;
+
         let mut file: File = fs::OpenOptions::new()
             .create(true)
             .append(true)

src-tauri/src/core/threads/tests.rs

@@ -1,4 +1,3 @@
-use crate::core::app::commands::get_jan_data_folder_path;
 
 use super::commands::*;
 use serde_json::json;
@@ -9,11 +8,18 @@ use tauri::test::{mock_app, MockRuntime};
 // Helper to create a mock app handle with a temp data dir
 fn mock_app_with_temp_data_dir() -> (tauri::App<MockRuntime>, PathBuf) {
     let app = mock_app();
-    let data_dir = get_jan_data_folder_path(app.handle().clone());
+    // Create a unique test directory to avoid race conditions between parallel tests
+    let unique_id = std::thread::current().id();
+    let timestamp = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_nanos();
+    let data_dir = std::env::current_dir()
+        .unwrap_or_else(|_| PathBuf::from("."))
+        .join(format!("test-data-{:?}-{}", unique_id, timestamp));
     println!("Mock app data dir: {}", data_dir.display());
-    // Patch get_data_dir to use temp dir (requires get_data_dir to be overridable or injectable)
+    // Ensure the unique test directory exists
-    // For now, we assume get_data_dir uses tauri::api::path::app_data_dir(&app_handle)
+    let _ = fs::create_dir_all(&data_dir);
-    // and that we can set the environment variable to redirect it.
     (app, data_dir)
 }
 

web-app/src/containers/HeaderPage.tsx

@@ -2,26 +2,41 @@ import { useLeftPanel } from '@/hooks/useLeftPanel'
 import { cn } from '@/lib/utils'
 import { IconLayoutSidebar } from '@tabler/icons-react'
 import { ReactNode } from 'react'
+import { useMobileScreen, useSmallScreen } from '@/hooks/useMediaQuery'
 
 type HeaderPageProps = {
   children?: ReactNode
 }
 const HeaderPage = ({ children }: HeaderPageProps) => {
   const { open, setLeftPanel } = useLeftPanel()
+  const isMobile = useMobileScreen()
+  const isSmallScreen = useSmallScreen()
 
   return (
     <div
       className={cn(
-        'h-10 pl-18 text-main-view-fg flex items-center shrink-0 border-b border-main-view-fg/5',
+        'h-10 text-main-view-fg flex items-center shrink-0 border-b border-main-view-fg/5',
-        IS_MACOS && !open ? 'pl-18' : 'pl-4',
+        // Mobile-first responsive padding
+        isMobile ? 'px-3' : 'px-4',
+        // macOS-specific padding when panel is closed
+        IS_MACOS && !open && !isSmallScreen ? 'pl-18' : '',
         children === undefined && 'border-none'
       )}
     >
-      <div className="flex items-center w-full gap-2">
+      <div className={cn(
+        'flex items-center w-full',
+        // Adjust gap based on screen size
+        isMobile ? 'gap-2' : 'gap-3'
+      )}>
         {!open && (
           <button
-            className="size-5 cursor-pointer flex items-center justify-center rounded hover:bg-main-view-fg/10 transition-all duration-200 ease-in-out data-[state=open]:bg-main-view-fg/10"
+            className={cn(
+              'cursor-pointer flex items-center justify-center rounded hover:bg-main-view-fg/10 transition-all duration-200 ease-in-out data-[state=open]:bg-main-view-fg/10',
+              // Larger touch target on mobile
+              isMobile ? 'size-8 min-w-8' : 'size-5'
+            )}
             onClick={() => setLeftPanel(!open)}
+            aria-label="Toggle sidebar"
           >
             <IconLayoutSidebar
               size={18}
@@ -29,9 +44,14 @@ const HeaderPage = ({ children }: HeaderPageProps) => {
             />
           </button>
         )}
+        <div className={cn(
+          'flex-1 min-w-0', // Allow content to shrink on small screens
+          isMobile && 'overflow-hidden'
+        )}>
           {children}
         </div>
       </div>
+    </div>
   )
 }
 

web-app/src/hooks/useMediaQuery.ts

@@ -77,7 +77,33 @@ export function useMediaQuery(
   return matches || false
 }
 
-// Specific hook for small screen detection
+// Specific hooks for different screen sizes
 export const useSmallScreen = (): boolean => {
   return useMediaQuery('(max-width: 768px)')
 }
+
+export const useMobileScreen = (): boolean => {
+  return useMediaQuery('(max-width: 640px)')
+}
+
+export const useTabletScreen = (): boolean => {
+  return useMediaQuery('(min-width: 641px) and (max-width: 1024px)')
+}
+
+export const useDesktopScreen = (): boolean => {
+  return useMediaQuery('(min-width: 1025px)')
+}
+
+// Orientation detection
+export const usePortrait = (): boolean => {
+  return useMediaQuery('(orientation: portrait)')
+}
+
+export const useLandscape = (): boolean => {
+  return useMediaQuery('(orientation: landscape)')
+}
+
+// Touch device detection
+export const useTouchDevice = (): boolean => {
+  return useMediaQuery('(pointer: coarse)')
+}

web-app/src/routes/index.tsx

@@ -4,6 +4,7 @@ import ChatInput from '@/containers/ChatInput'
 import HeaderPage from '@/containers/HeaderPage'
 import { useTranslation } from '@/i18n/react-i18next-compat'
 import { useTools } from '@/hooks/useTools'
+import { cn } from '@/lib/utils'
 
 import { useModelProvider } from '@/hooks/useModelProvider'
 import SetupScreen from '@/containers/SetupScreen'
@@ -18,6 +19,7 @@ type SearchParams = {
 import DropdownAssistant from '@/containers/DropdownAssistant'
 import { useEffect } from 'react'
 import { useThreads } from '@/hooks/useThreads'
+import { useMobileScreen } from '@/hooks/useMediaQuery'
 
 export const Route = createFileRoute(route.home as any)({
   component: Index,
@@ -32,6 +34,7 @@ function Index() {
   const search = useSearch({ from: route.home as any })
   const selectedModel = search.model
   const { setCurrentThreadId } = useThreads()
+  const isMobile = useMobileScreen()
   useTools()
 
   // Conditional to check if there are any valid providers
@@ -56,13 +59,33 @@ function Index() {
       <HeaderPage>
         <DropdownAssistant />
       </HeaderPage>
-      <div className="h-full px-4 md:px-8 overflow-y-auto flex flex-col gap-2 justify-center">
+      <div className={cn(
-        <div className="w-full md:w-4/6 mx-auto">
+        "h-full overflow-y-auto flex flex-col gap-2 justify-center",
-          <div className="mb-8 text-center">
+        // Mobile-first responsive padding
-            <h1 className="font-editorialnew text-main-view-fg text-4xl">
+        isMobile ? "px-3 py-4" : "px-4 md:px-8"
+      )}>
+        <div className={cn(
+          "mx-auto",
+          // Full width on mobile, constrained on desktop
+          isMobile ? "w-full max-w-full" : "w-full md:w-4/6"
+        )}>
+          <div className={cn(
+            "text-center",
+            // Adjust spacing for mobile
+            isMobile ? "mb-6" : "mb-8"
+          )}>
+            <h1 className={cn(
+              "font-editorialnew text-main-view-fg",
+              // Responsive title size
+              isMobile ? "text-2xl sm:text-3xl" : "text-4xl"
+            )}>
               {t('chat:welcome')}
             </h1>
-            <p className="text-main-view-fg/70 text-lg mt-2">
+            <p className={cn(
+              "text-main-view-fg/70 mt-2",
+              // Responsive description size
+              isMobile ? "text-base" : "text-lg"
+            )}>
               {t('chat:description')}
             </p>
           </div>

web-app/src/routes/threads/$threadId.tsx

@@ -22,7 +22,7 @@ import { useAppearance } from '@/hooks/useAppearance'
 import { ContentType, ThreadMessage } from '@janhq/core'
 import { useTranslation } from '@/i18n/react-i18next-compat'
 import { useChat } from '@/hooks/useChat'
-import { useSmallScreen } from '@/hooks/useMediaQuery'
+import { useSmallScreen, useMobileScreen } from '@/hooks/useMediaQuery'
 import { useTools } from '@/hooks/useTools'
 
 // as route.threadsDetail
@@ -47,6 +47,7 @@ function ThreadDetail() {
   const { appMainViewBgColor, chatWidth } = useAppearance()
   const { sendMessage } = useChat()
   const isSmallScreen = useSmallScreen()
+  const isMobile = useMobileScreen()
   useTools()
 
   const { messages } = useMessages(
@@ -308,14 +309,19 @@ function ThreadDetail() {
           ref={scrollContainerRef}
           onScroll={handleScroll}
           className={cn(
-            'flex flex-col h-full w-full overflow-auto px-4 pt-4 pb-3'
+            'flex flex-col h-full w-full overflow-auto pt-4 pb-3',
+            // Mobile-first responsive padding
+            isMobile ? 'px-3' : 'px-4'
           )}
         >
           <div
             className={cn(
-              'w-4/6 mx-auto flex max-w-full flex-col grow',
+              'mx-auto flex max-w-full flex-col grow',
-              chatWidth === 'compact' ? 'w-full md:w-4/6' : 'w-full',
+              // Mobile-first width constraints
-              isSmallScreen && 'w-full'
+              // Mobile and small screens always use full width, otherwise compact chat uses constrained width
+              isMobile || isSmallScreen || chatWidth !== 'compact'
+                ? 'w-full'
+                : 'w-full md:w-4/6'
             )}
           >
             {messages &&
@@ -355,9 +361,13 @@ function ThreadDetail() {
         </div>
         <div
           className={cn(
-            'mx-auto pt-2 pb-3 shrink-0 relative px-2',
+            'mx-auto pt-2 pb-3 shrink-0 relative',
-            chatWidth === 'compact' ? 'w-full md:w-4/6' : 'w-full',
+            // Responsive padding and width
-            isSmallScreen && 'w-full'
+            isMobile ? 'px-3' : 'px-2',
+            // Width: mobile/small screens or non-compact always full, compact desktop uses constrained
+            isMobile || isSmallScreen || chatWidth !== 'compact'
+              ? 'w-full'
+              : 'w-full md:w-4/6'
           )}
         >
           <div