style: Integrate search form and table into single card container

- Consolidate filter/search form with data table in one card
- Separate with <hr class='my-0'> for visual hierarchy
- Remove redundant card-mb spacing and gaps
- Unified layout for Blog, Clients, Inquiries pages
- Cleaner, more cohesive data display

Applied to:
- Blog/Index.cshtml
- Clients/Index.cshtml
- Inquiries/Index.cshtml

Announcements and Faqs already have integrated structure (no search form)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.gitignore

@@ -63,3 +63,4 @@ appsettings.Development.json
 
 # Scratch / temporary work - never commit, see docs/ENGINEERING_HARNESS.md
 .scratch/
+tmp/