Convert chatbot slash commands to agents with anonymous issue reporting

[Copilot]

Replace chatbot slash commands (/help, /stats, etc.) with an "agents" UI pattern. Add a new Report Issue agent supporting anonymous bug submission with required screenshot capture.

Changes

UI (header.html)

• Replace gray slash command buttons with colored, icon-labeled agent buttons
• Add collapsible Report Issue form with URL input, description, anonymous checkbox, and screenshot capture
• Screenshot capture uses html2canvas with SRI integrity hash
• Two screenshot capture modes:
  • Full Page - captures the entire page
  • Select Area - click and drag to select a specific region (ESC to cancel)

Backend (website/api/views.py)

• New ChatbotReportIssueView at /api/chatbot/report-issue/
• Handles base64 screenshot upload, domain lookup, and IP tracking for anonymous submissions
• URL parsing preserves path/query/fragment correctly
• Screenshot is required for issue submission

# Anonymous reporting with required screenshot
POST /api/chatbot/report-issue/
{
    "url": "example.com/page",
    "description": "Bug description",
    "screenshot": "data:image/png;base64,...",  # required
    "anonymous": true
}

Agent Types

Agent	Color	Function
Help	Blue	Show available agents
Stats	Green	Link to platform stats
Bid	Purple	Bidding info
Bacon	Yellow	Token info
Report Issue	Red	Open issue form

Legacy slash commands remain functional for backward compatibility.

• Fixes OWASP-BLT/BLT#5117

Original prompt

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This section details on the original issue you should resolve

<issue_title>instead of slash commands have the chat bot have "agents" and each slash command is instead an agent - also add an agent to report issues and take a screenshot of the page its on and then add that issue to BLT - allow for anonymous issue reporting</issue_title> <issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes OWASP-BLT/BLT#5117

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