✨ [desktop]: Implement deep link prompt import functionality

[yuler]

Summary

• Implemented deep link support using tauri-plugin-deep-link and tauri-plugin-single-instance.
• Added frontend listener for typo://import-prompt?id=xxx deep links.
• Created DeepLinkImportModal for user confirmation before importing.
• Implemented data fetching from typo.yuler.cc with persistence to local store.
• Added i18n support for English, Chinese, and Japanese.
• Included design specification and implementation plan.

Test plan

• Manual test: Trigger typo://import-prompt?id=test and verify modal appearance and data import.
• Verify single instance behavior: Clicking a link when app is closed vs open.

[gemini-code-assist]

Code Review

This pull request implements a deep link import feature for prompts using Tauri's deep-link and single-instance plugins. It includes the necessary Rust backend configuration, a new Vue component for the import modal, and frontend logic to handle the typo://import-prompt scheme. Feedback highlights a breaking change regarding the application identifier, the need for better data validation in the import handler, and the importance of URL encoding when fetching remote prompt data.

[yuler]

Addressed review comments:

• Reverted application identifier to com.typo.app to avoid breaking changes.
• Improved data validation in handleImportSuccess to ensure required fields are present.
• Used encodeURIComponent for the prompt ID when fetching data to handle special characters correctly.