P3: Better empty-state with active filter badges and clear-all

[hasitpbhatt]

Problem: When combining filters (e.g., Spotlight + No Expiry) that yield no results, the empty state just says 'No deals found / Try adjusting your keywords or category filters' — but doesn't tell the user which filters are active.

Fix:

• Show active filter badges in the empty state
• Add a 'Clear all filters' one-click link
• Help the user understand why they got zero results

Files to modify:

• js/search.js — empty state rendering in
  enderDeals()
• css/style.css — empty state filter badge styles