Add flight price navigation and multilingual interface

[hoangsvit]

Summary

Adds a clear path from the main travel dashboard to the Flight Price Watch and introduces shared multilingual UI support.

Navigation

• Adds Flight prices to the desktop header navigation.
• Adds Watch flight prices to the hero actions.
• Changes the Flights essentials card to open /flights/ instead of sending users straight to Google Flights.
• Adds Flight prices to the mobile bottom navigation.

Languages

Shared i18n.js now supports:

• English
• Tiếng Việt
• 中文 (Simplified Chinese)
• 日本語

The language selector appears on both the main dashboard and Flight Price Watch, remembers the choice in localStorage (travel-language), and auto-detects the browser language for first-time visitors.

Other fixes

• Fixes the existing trip-day off-by-one calculation so 20–26 Oct displays 7 days.
• Replaces the ambiguous 3 flight legs max stat with 2 return options.
• Bumps the PWA cache and includes i18n.js for offline use.

Notes

The Flight Price Watch remains at /flights/ and continues to use the existing SerpApi/GitHub Actions data flow.

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[coderabbitai]

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[github-actions]

🌍 Web preview

• Open travel dashboard
• Open live flight prices

Preview is pinned to commit ea3fbf8 and updates automatically when the PR changes.