feat: supports dark mode

[zhu-xiaowei]

Description

1. Support Dark Mode on Android, iOS and Mac (Following system settings).
2. Support adding richer document formats（'json', 'py', 'ts', 'tsx', 'js', 'kt', 'java', 'swift', 'c', 'm', 'h', 'sh', 'cpp', 'rs', 'go', 'class', 'cs', 'php', 'rb', 'dart', 'sql', 'css', 'xml', 'yaml'）as plain text in user prompt.
3. Support adding documents for Ollama models and models compatible with OpenAI format.
4. Support thinking mode for Claude sonnet 4 and Claude opus 4
5. Support New Nova Sonic Voice ID Lupe and Carlos in Spanish.
6. Optimize audio WaveForm rendering for chat screen
7. Fix crash issue for add voice system prompt

General Checklist

• The code changes have been fully tested
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of the least privilege, etc.)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT-0 license.