feat(v4): Update the report pages to show aggregate values (#10766)

This PR updates the report pages for agents, inboxes, and teams by
replacing charts with aggregate values (under a feature flag). Users can
click on any item to view more details if needed. Most users seem to
prefer aggregate values, so this change will likely stay.

The PR also includes a few fixes:

- The summary reports now use the same logic for both the front-end and
CSV exports.
- Fixed an issue where a single quote was being added to values with
hyphens in CSV files. Now, ‘n/a’ is used when no value is available.
- Fixed a bug where the average value was calculated incorrectly when
multiple accounts were present.

These changes should make reports easier to use and more consistent.

### Agents:

<img width="1438" alt="Screenshot 2025-01-26 at 10 47 18 AM"
src="https://github.com/user-attachments/assets/bf2fcebc-6207-4701-9703-5c2110b7b8a0"
/>

### Inboxes
<img width="1438" alt="Screenshot 2025-01-26 at 10 47 10 AM"
src="https://github.com/user-attachments/assets/b83e1cf2-fd14-4e8e-8dcd-9033404a9f22"
/>


### Teams: 
<img width="1436" alt="Screenshot 2025-01-26 at 10 47 01 AM"
src="https://github.com/user-attachments/assets/96b1ce07-f557-42ca-8143-546a111d6458"
/>

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>

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

@@ -124,6 +124,7 @@
   },
   "AGENT_REPORTS": {
     "HEADER": "Agents Overview",
+    "DESCRIPTION": "Easily track agent performance with key metrics such as conversations, response times, resolution times, and resolved cases. Click an agent’s name to learn more.",
     "LOADING_CHART": "Loading chart data...",
     "NO_ENOUGH_DATA": "We've not received enough data points to generate report, Please try again later.",
     "DOWNLOAD_AGENT_REPORTS": "Download agent reports",
@@ -258,6 +259,7 @@
   },
   "INBOX_REPORTS": {
     "HEADER": "Inbox Overview",
+    "DESCRIPTION": "Quickly view your inbox performance with key metrics like conversations, response times, resolution times, and resolved cases—all in one place. Click an inbox name for more details.",
     "LOADING_CHART": "Loading chart data...",
     "NO_ENOUGH_DATA": "We've not received enough data points to generate report, Please try again later.",
     "DOWNLOAD_INBOX_REPORTS": "Download inbox reports",
@@ -325,6 +327,7 @@
   },
   "TEAM_REPORTS": {
     "HEADER": "Team Overview",
+    "DESCRIPTION": "Get a snapshot of your team’s performance with essential metrics, including conversations, response times, resolution times, and resolved cases. Click a team name for more details.",
     "LOADING_CHART": "Loading chart data...",
     "NO_ENOUGH_DATA": "We've not received enough data points to generate report, Please try again later.",
     "DOWNLOAD_TEAM_REPORTS": "Download team reports",
@@ -538,5 +541,15 @@
       },
       "VIEW_DETAILS": "View Details"
     }
+  },
+  "SUMMARY_REPORTS": {
+    "INBOX": "Inbox",
+    "AGENT": "Agent",
+    "TEAM": "Team",
+    "AVG_RESOLUTION_TIME": "Avg. Resolution Time",
+    "AVG_FIRST_RESPONSE_TIME": "Avg. First Response Time",
+    "AVG_REPLY_TIME": "Avg. Customer Waiting Time",
+    "RESOLUTION_COUNT": "Resolution Count",
+    "CONVERSATIONS": "No. of conversations"
   }
 }