Release v2.1.5

Features

• Add copy-to-clipboard button for code blocks

Fixes

• Filter out Gemini API responses marked as internal thoughts
• Add size safeguards for PDF and image compression failures

Improvements

• Highlight currently selected model in model picker
• Improve Linux sandbox interactive interface
• Adjust Gemma 4 device performance expectations
• Upgrade BouncyCastle and remove version checker dependency
• UI polish and alignment