Add search result count and 'no results' message

[AnjanJ]

Description

Improve search experience by showing result count and helpful message when no errors match filters.

Current Behavior

• When filters return no results, page shows empty list
• No indication of how many results were found
• Users may not realize filters are too restrictive

Desired Behavior

1. Result count: Show "Showing X of Y errors" above list
2. No results message: When list is empty, show helpful message:
   • "No errors found matching your filters"
   • Suggest removing some filters
   • Show "Clear all filters" button
3. Empty state: When truly no errors exist, show different message:
   • "No errors logged yet"
   • Show helpful onboarding text

Implementation Hints

• Check @errors.total_count (from Pagy) for filtered count
• Check ErrorLog.count for total count
• Display above error list table
• Add conditional rendering: if @errors.empty?
• Style with Bootstrap alert component

Files to Modify

• /app/views/rails_error_dashboard/errors/index.html.erb - Add count and empty state
• /app/controllers/rails_error_dashboard/errors_controller.rb - May need to expose total count

Example UI

Showing 23 of 156 errors

[Error list...]

When no results:

┌─────────────────────────────────────┐
│  🔍 No errors found                 │
│                                     │
│  Try removing some filters or      │
│  [Clear All Filters] button        │
└─────────────────────────────────────┘

Good First Issue Because

• Simple view changes
• Improves UX significantly
• Easy to test visually
• Minimal backend changes

Nice to Have

• Animated empty state icon
• Show which filters are active
• Link to clear individual filters

[AnjanJ]

Update: After reviewing the codebase, I found that empty state messaging already exists:

✅ Already Implemented:

• Empty state message when no errors match filters (lines 388-398)
• Different messages for filtered vs no-errors scenarios
• "All Clear!" message with icon

❌ Still Missing:

• Result count display ("Showing X of Y errors")
• Total count vs filtered count
• "Clear all filters" button

This is still a valid "good first issue" but with a narrower scope focusing on adding the result count display above the table.