fix: stale report value shown if summary fetch breaks (#11270)

This pull request includes several changes to better show the report
metrics fetching status on the dashboard. This also prevents showing
stale data in case fetching summary fails due to timeout or other issue

The most important changes include adding a new fetching status state to
the store called `summaryFetchingStatus`, updating the
`useReportMetrics` composable, and modifying the `ChartStats` component
to handle different fetching statuses.

#### Loading
![CleanShot 2025-04-09 at 13 49
35@2x](https://github.com/user-attachments/assets/575c9905-0bf7-4a6e-8709-026896dd95f8)

#### Finished
![CleanShot 2025-04-09 at 13 49
43@2x](https://github.com/user-attachments/assets/ef7f8cb3-ca34-4627-a954-ba23f156d2ff)

#### Failed
<img width="1512" alt="image"
src="https://github.com/user-attachments/assets/d521a785-9299-4e59-94dc-561a7a84377e"
/>

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/composables/useReportMetrics.js

@@ -7,8 +7,12 @@ import { formatTime } from '@chatwoot/utils';
  * @param {string} [accountSummaryKey='getAccountSummary'] - The key for accessing account summary data.
  * @returns {Object} An object containing utility functions for report metrics.
  */
-export function useReportMetrics(accountSummaryKey = 'getAccountSummary') {
+export function useReportMetrics(
+  accountSummaryKey = 'getAccountSummary',
+  summarFetchingKey = 'getAccountSummaryFetchingStatus'
+) {
   const accountSummary = useMapGetter(accountSummaryKey);
+  const fetchingStatus = useMapGetter(summarFetchingKey);
 
   /**
    * Calculates the trend percentage for a given metric.
@@ -53,5 +57,6 @@ export function useReportMetrics(accountSummaryKey = 'getAccountSummary') {
     calculateTrend,
     isAverageMetricType,
     displayMetric,
+    fetchingStatus,
   };
 }