fix: Chinese path support (issue #3),

[Poorgramer-Zack]

[PR] Windows PTY Encoding Fix, Shell Selection Enhancements, and Update Cleanup Overhaul

Description

This PR addresses several core issues related to terminal compatibility on Windows, platform-specific shell management, and the reliability of the application's update and cleanup mechanism.

1. 🪟 Windows PTY Encoding Fix (Fixes #3)

• Issue: Pseudo-terminals (PTY) failed to launch on Windows when the executable or working directory paths contained non-ASCII characters (e.g., Chinese characters).
• Solution: Refactored the native C code in flutter_pty_win.c to use the Windows MultiByteToWideChar API. Strings are now correctly converted from UTF-8 to Wide Character (UTF-16) before being passed to Windows system calls.
• Result: Fixed the "Failed to create process" error for users with non-English usernames or file paths.

2. 🐚 Shell Selection & Reliability

• Platform Filtering: Added zsh and bash support. Implemented isAvailableOnCurrentPlatform to hide Windows-only shells (like PowerShell/CMD/WSL) on macOS/Linux and vice-versa.
• Runtime Fallback: Implemented a robust fallback mechanism in TerminalBloc and ShellType. On Windows, the app now dynamically checks for the existence of pwsh, falling back to powershell and finally cmd if necessary.
• Logic Refactor: Refactored getBinaryUrl to use specialized switch (Platform.operatingSystem) statements for cleaner cross-platform asset resolution.

3. 📦 Update Mechanism & MSIX Removal

• MSIX Removal: Due to persistent certificate trust issues (0x800B010A), the MSIX packaging and deployment steps have been completely removed from the project pubspec.yaml, GitHub workflows, and codebase).
• Windows Strategy: The application now strictly uses standard -setup.exe installers for Windows updates.
• Cleanup Overhaul:
  • Moved download location to the system Temp directory instead of the user's Downloads folder.
  • Pattern-based Cleanup: Replaced single-session file tracking with a "Scan-on-Startup" strategy. The app now scans the temp directory for any leftover flutter_agent_panel-* installer residues on startup and after update checks, ensuring a clean user environment even after restarts.

4. 🛠️ Miscellaneous

• Updated pubspec.yaml versioning and resolved duplicate dependency declarations.
• Cleaned up release.yml workflow to streamline the build process for Windows, macOS, and Linux.

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Technical Details

• Native: Modified packages/flutter_pty/src/flutter_pty_win.c.
• Bloc: Updated TerminalBloc for runtime shell validation.
• Service: Overhauled AppVersionService for asset selection.
• UI: Updated UpdateSettingsContent with enhanced cleanup logic.

Verification

• Verified Chinese path support on Windows.
• Verified shell list filtering on Windows and macOS.
• Verified that .exe installers are correctly identified and leftover files are cleaned from %TEMP%.
• Ran flutter analyze - No errors found.

[Copilot]

Pull request overview

This PR addresses critical Windows PTY encoding issues for non-ASCII paths, enhances cross-platform shell selection, and overhauls the update mechanism by removing MSIX packaging in favor of standard installers.

Key Changes:

• Implemented UTF-8 to UTF-16 conversion in native Windows PTY code to support Chinese and other non-ASCII characters in paths
• Added zsh and bash shell support with platform-specific filtering and Windows shell fallback logic (pwsh → powershell → cmd)
• Replaced MSIX packaging with standard installers and moved downloads to temp directory with pattern-based cleanup on startup

Reviewed changes

Copilot reviewed 18 out of 19 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
pubspec.yaml	Bumped version to 0.0.7+1 and removed MSIX dependency
pubspec.lock	Removed transitive dependencies for MSIX package (console, get_it)
packages/flutter_pty/src/flutter_pty_win.c	Added utf8_to_wide conversion function and refactored command/environment/working_directory builders to properly handle UTF-8 strings
lib/shared/utils/settings_helpers.dart	Added localized name mappings for zsh and bash shells
lib/features/workspace/widgets/shell_selection_popover.dart	Removed dart:io import, updated shell filtering to use isAvailableOnCurrentPlatform
lib/features/terminal/bloc/terminal_bloc.dart	Updated imports and shell resolution to use ShellType.platformDefault and resolveWindowsCommand
lib/features/settings/widgets/update_settings_content.dart	Added cleanup mechanism for leftover installers in temp directory, moved download location from Downloads to temp
lib/features/settings/models/shell_type.dart	Added zsh/bash shells, implemented platform availability checks, added Windows shell fallback logic
lib/features/settings/models/app_settings.dart	Changed defaultShell to use platform-specific defaults
lib/features/settings/bloc/settings_state.dart	Updated constructor to support nullable AppSettings
lib/features/settings/bloc/settings_bloc.dart	Removed const modifier for AppSettings initialization
lib/core/services/app_version_service.dart	Added caching of release JSON and asset-based URL resolution with platform-specific switch statement
lib/core/l10n/app_localizations*.dart	Added zsh and bash localization strings
assets/l10n/app_*.arb	Added zsh and bash translation entries
.github/workflows/release.yml	Removed MSIX build and upload steps, simplified release table

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