chore: Improvements in pending FAQs (#12755)

# Pull Request Template

## Description

**This PR includes:**

1. Added URL-based filter persistence for the responses pages, including
page and search parameters.
2. Introduced a new empty state variant for pending FAQs — without a
backdrop and with a “Clear Filters” option.
3. Made the actions, filter, and search row remain fixed at the top
while scrolling.

Fixes
https://linear.app/chatwoot/issue/CW-5852/improvements-in-pending-faqs

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

### Loom video
https://www.loom.com/share/1d9eee68c0684f0ab05e08b4ca1e0ce9


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

app/javascript/dashboard/i18n/locale/en/integrations.json

@@ -942,7 +942,9 @@
       },
       "EMPTY_STATE": {
         "TITLE": "No FAQs Found",
+        "NO_PENDING_TITLE": "There are no more pending FAQs to review",
         "SUBTITLE": "FAQs help your assistant provide quick and accurate answers to questions from your customers. They can be generated automatically from your content or can be added manually.",
+        "CLEAR_SEARCH": "Clear active filters",
         "FEATURE_SPOTLIGHT": {
           "TITLE": "Captain FAQ",
           "NOTE": "Captain FAQs detects common customer questions—whether missing from your knowledge base or frequently asked—and generates relevant FAQs to improve support. You can review each suggestion and decide whether to approve or reject it."