chore: bump version to 0.2.7

[chenyme]

✨ Feature

• Added Skills management, allowing admins to maintain built-in Skills and users to create custom Skills that can be loaded into conversations with /.
• Added a unified Skills and Prompts page for managing reusable conversation context.
• Added / selection in the chat composer for inserting Prompts and loading Skills.
• Added collapsible sidebar sections for recent conversations, starred conversations, and projects.
• Added persistent sidebar state, so collapsed sections are remembered locally.
• Added user activity tracking, with “last active” visibility and sorting in the admin user list.
• Added OpenAI Responses support for instructions and previous response IDs to improve stateful response continuity.
• Added locked model option paths, allowing admins to prevent key model parameters from being overridden in chat.
• Added improved model option filtering and input generation for background text tasks such as titles and summaries.
• Added automatic avatar saving after upload.

⚡ Optimization

• Improved chat composer resizing for smoother long-message input.
• Improved message metadata visibility on touch devices such as tablets.
• Improved sidebar auto-collapse behavior and navigation animations.
• Improved AuthGuard session handling for expired or refreshed login states.
• Improved file processing timeouts and batch parsing responses for more stable extraction workflows.
• Improved native model tool and parameter configuration UI for clearer tool selection and option control.
• Improved tool-run handling with clearer errors when a run does not produce a final answer.
• Improved Prompt Preset and Skill injection logic for more stable conversation context composition.
• Improved chat placeholder text and mention selection interactions.

🐛 Fixed

• Fixed registration email validation to reject control characters and normalize SMTP recipients.
• Fixed cross-platform ID parsing issues caused by integer-size differences.
• Fixed load-more sentinel logic that could retrigger while more items were already loading.
• Fixed chat font variable configuration that could cause inconsistent font rendering.
• Fixed incomplete error handling when tool runs returned no final answer.
• Fixed frontend route type path issues that could affect type generation or builds.