feat: add project_sidebar plugin to index

[mbradaschia]

Project Sidebar

A frontend-only Agent Zero plugin that replaces the default chats list with a project-grouped sidebar view.

Features

• Collapsible project groups sorted by most recent chat activity
• Persistent collapse state via localStorage
• Edit shortcut on hover linking to project settings
• No Project group for unassigned chats
• Status indicators matching chat_status_marklet visual style
• Interoperability data attributes (data-chat-id, data-project-name) for other plugins

Plugin Details

• GitHub: https://github.com/mbradaschia/a0-project-sidebar
• Type: Frontend-only (no backend changes)
• Version: 1.0.0
• Tags: ui, web, workflow, tools

Checklist

• index.yaml with required fields (title, description, github)
• thumbnail.png (4KB square image)
• Plugin folder name matches name in plugin.yaml: project_sidebar
• Tags from TAGS.md (≤ 5)
• Description ≤ 500 characters
• LICENSE at repo root
• README.md at repo root
• Adds exactly one new plugin folder

[a0-bot]

Plugin submission validation failed

ERROR: Only files under plugins/ are allowed in plugin PRs: TAGS.md

[a0-bot]

Plugin submission validation failed

ERROR: Unexpected file in plugin folder: .gitignore