Add tooltips to dashboard statistics cards

[AnjanJ]

Description

Add helpful tooltips to dashboard statistics cards to explain what each metric means and how it's calculated.

Current Behavior

• Dashboard shows cards with numbers (Total Errors, Resolved, Unresolved, etc.)
• No explanation of what these numbers represent
• Users may not understand metrics like MTTR

Desired Behavior

Add tooltips (hover popups) to each stat card that explain:

• Total Errors: "Total number of unique error types logged"
• Resolved: "Errors marked as resolved by team members"
• Unresolved: "Errors that still need attention"
• Critical: "Errors with critical severity level"
• Error Rate: "Average errors per day over last 7 days"
• MTTR: "Mean Time To Resolution - Average time between error occurrence and resolution"

Implementation Hints

• Use Bootstrap tooltips (already included)
• Add data-bs-toggle="tooltip" attribute
• Add data-bs-title="Explanation text" attribute
• Add info icon (ℹ️ or FontAwesome icon) next to stat title
• Initialize tooltips with JavaScript: new bootstrap.Tooltip(el)

Files to Modify

• /app/views/rails_error_dashboard/dashboard/show.html.erb - Add tooltip attributes
• Layout or JavaScript file - Initialize Bootstrap tooltips

Example Code

<div class="card">
  <h5>
    Total Errors
    <i class="bi bi-info-circle" 
       data-bs-toggle="tooltip" 
       data-bs-title="Total number of unique error types logged"></i>
  </h5>
  <div class="display-4"><%= @stats[:total_errors] %></div>
</div>

Good First Issue Because

• Small, focused change
• Improves documentation and UX
• Primarily HTML changes
• Easy to test (hover and see tooltip)

Nice to Have

• Click to show tooltip on mobile (no hover)
• Link to documentation from tooltip
• Different tooltip placement (top, bottom, left, right) for better UX

[AnjanJ]

Update: After reviewing the codebase, tooltips are already extensively used throughout the application on error rows, badges, and other UI elements. However, tooltips are missing from the dashboard statistics cards specifically.

✅ Tooltips Already Exist On:

• Severity badges (with explanations)
• Priority scores
• Error types
• "NEW" indicators
• User impact percentages
• And many more places

❌ Missing On:

• Dashboard stats cards (Today, This Week, Unresolved, Resolved)
• These would benefit from explanatory tooltips

This is still a valid "good first issue" - just needs to focus specifically on adding tooltips to the stats cards.