feat(tauri): Migrate from Tauri v1 to v2

# Summary
This commit completes the migration from Tauri v1 to v2, resolves configuration issues, upgrades Next.js, and adds test coverage for critical components to ensure stability during the transition.

# Details
## Tauri v2 Migration
- Updated Tauri dependencies to v2.3.0 series in package.json
- Restructured build configuration in `/app/config/build.ts` to align with Tauri v2 requirements
- Fixed imports and API usage patterns across the codebase
- Added compatibility layer for window.__TAURI__ references to maintain backward compatibility

## Next.js Issues
- Upgraded Next.js from 14.1.1 to 14.2.24
- Resolved caching problems with Server Actions
- Updated eslint-config-next to match the new version
- Cleared Next.js cache and temporary files to address build issues

## Testing & Stability
- Added comprehensive tests for `stream.ts` to verify streaming functionality
- Created mocks for Tauri API to support test environment
- Verified that critical functionality continues to work correctly
- Translated all comments to English for consistency

## Infrastructure
- Fixed peer dependency warnings during installation
- Ensured proper integration with Tauri v2 plugins (clipboard-manager, dialog, fs, http, notification, shell, updater, window-state)

# Approach
Prioritized stability by:
1. Making minimal necessary changes to configuration files
2. Preserving most `window.__TAURI__` calls as they still function in v2
3. Planning gradual migration to new APIs with test coverage for critical components
4. Documenting areas that will require future attention

# Testing
- Created unit tests for critical streaming functionality
- Performed manual testing of key application features
- Verified successful build and launch with Tauri v2

# Future Work
- Future PRs will gradually replace deprecated Tauri v1 API calls with v2 equivalents
- Additional test coverage will be added for other critical components

app/components/exporter.tsx

@@ -40,6 +40,8 @@ import { type ClientApi, getClientApi } from "../client/api";
 import { getMessageTextContent } from "../utils";
 import { MaskAvatar } from "./mask";
 import clsx from "clsx";
+import { save } from "@tauri-apps/plugin-dialog";
+import { writeFile } from "@tauri-apps/plugin-fs";
 
 const Markdown = dynamic(async () => (await import("./markdown")).Markdown, {
   loading: () => <LoadingIcon />,
@@ -456,7 +458,7 @@ export function ImagePreviewer(props: {
 
       if (isMobile || (isApp && window.__TAURI__)) {
         if (isApp && window.__TAURI__) {
-          const result = await window.__TAURI__.dialog.save({
+          const result = await save({
             defaultPath: `${props.topic}.png`,
             filters: [
               {
@@ -474,7 +476,7 @@ export function ImagePreviewer(props: {
             const response = await fetch(blob);
             const buffer = await response.arrayBuffer();
             const uint8Array = new Uint8Array(buffer);
-            await window.__TAURI__.fs.writeBinaryFile(result, uint8Array);
+            await writeFile(result, uint8Array);
             showToast(Locale.Download.Success);
           } else {
             showToast(Locale.Download.Failed);