feat: Implemented search results page functionality (#11086)

# Pull Request Template

## Description
Implemented search results page functionality. Now you can press "Enter"
to search by term and display results in a results page. Also now you
can link to /hc/{account}/en/search?query=XXXXXX to view search results
for XXXXXX query.

fixes: https://github.com/chatwoot/chatwoot/issues/10945

## Screenshots

Classic layout search results:
<img width="3840" height="2160" alt="classic-results"
src="https://github.com/user-attachments/assets/3bbb3272-33ca-4eb4-b80a-76ed77442088"
/>

Classic layout pagination:
<img width="3840" height="2160" alt="classic-page-two"
src="https://github.com/user-attachments/assets/062b09d3-7c58-4d3b-8611-b94375e7db51"
/>

Classic layout empty search:
<img width="3840" height="2160" alt="no-results"
src="https://github.com/user-attachments/assets/c5e3f47a-cd9a-4e14-ae92-ccba00c89e98"
/>

Documentation layout search results:
<img width="3840" height="2160" alt="documentation-results"
src="https://github.com/user-attachments/assets/9e45d8d9-c975-4589-b6c6-3bc7bb3c588e"
/>

Documentation layout dark theme:
<img width="3840" height="2160" alt="documentation-dark"
src="https://github.com/user-attachments/assets/cdb6ed63-4241-4b32-9f79-7d92ed479fc8"
/>

Plain embedded dark layout:
<img width="3840" height="2160" alt="plain-embedded-dark"
src="https://github.com/user-attachments/assets/7deb02b9-9f24-48fb-8979-a2ecd7002c05"
/>

---------

Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>
Co-authored-by: Pranav <pranav@chatwoot.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Vinay Keerthi <11478411+stonecharioteer@users.noreply.github.com>

config/locales/en.yml

@@ -427,6 +427,13 @@ en:
       empty_placeholder: No results found.
       loading_placeholder: Searching...
       results_title: Search results
+      results: Search Results
+      results_for: "Search Results for '%{query}'"
+      no_results: "No results found for '%{query}'"
+      found_results:
+        one: Found 1 result
+        other: 'Found %{count} results'
+      submit: Search
     toc_header: 'On this page'
     sidebar:
       help_center: Help Center
@@ -458,6 +465,8 @@ en:
       others: others
       by: By
       no_articles: There are no articles here
+      previous: Previous
+      next: Next
     article_actions:
       label: Open in
       view_markdown: View as Markdown

config/routes.rb

@@ -590,6 +590,7 @@ Rails.application.routes.draw do
   get 'hc/:slug', to: 'public/api/v1/portals#show'
   get 'hc/:slug/sitemap.xml', to: 'public/api/v1/portals#sitemap'
   get 'hc/:slug/:locale', to: 'public/api/v1/portals#show', as: :public_portal_locale
+  get 'hc/:slug/:locale/search', to: 'public/api/v1/portals/search#index', as: :portal_search
   get 'hc/:slug/:locale/articles', to: 'public/api/v1/portals/articles#index'
   get 'hc/:slug/:locale/categories', to: 'public/api/v1/portals/categories#index'
   get 'hc/:slug/:locale/categories/:category_slug', to: 'public/api/v1/portals/categories#show', as: :public_portal_category