feat: Rewrite reportMixin to a composable (#10029)

# Pull Request Template

## Description

The PR will replace the usage of `reportMixin` with the help of
`useReportMetrics()` composable.

Fixes
https://linear.app/chatwoot/issue/CW-3450/rewrite-reportmixin-mixin-to-a-composable

**Files updated**
1. dashboard/routes/dashboard/settings/reports/Index.vue
2. dashboard/routes/dashboard/settings/reports/BotReports.vue
3. dashboard/routes/dashboard/settings/reports/ReportContainer.vue
4.
dashboard/routes/dashboard/settings/reports/components/WootReports.vue
5.
dashboard/routes/dashboard/settings/reports/components/ChartElements/ChartStats.vue

## Type of change

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

## How Has This Been Tested?

Test the all the reports view.


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] 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
- [x] 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/composables/useReportMetrics.js

@@ -0,0 +1,57 @@
+import { useMapGetter } from 'dashboard/composables/store';
+import { formatTime } from '@chatwoot/utils';
+
+/**
+ * A composable function for report metrics calculations and display.
+ *
+ * @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') {
+  const accountSummary = useMapGetter(accountSummaryKey);
+
+  /**
+   * Calculates the trend percentage for a given metric.
+   *
+   * @param {string} key - The key of the metric to calculate trend for.
+   * @returns {number} The calculated trend percentage, rounded to the nearest integer.
+   */
+  const calculateTrend = key => {
+    if (!accountSummary.value.previous[key]) return 0;
+    const diff = accountSummary.value[key] - accountSummary.value.previous[key];
+    return Math.round((diff / accountSummary.value.previous[key]) * 100);
+  };
+
+  /**
+   * Checks if a given metric key represents an average metric type.
+   *
+   * @param {string} key - The key of the metric to check.
+   * @returns {boolean} True if the metric is an average type, false otherwise.
+   */
+  const isAverageMetricType = key => {
+    return [
+      'avg_first_response_time',
+      'avg_resolution_time',
+      'reply_time',
+    ].includes(key);
+  };
+
+  /**
+   * Formats and displays a metric value based on its type.
+   *
+   * @param {string} key - The key of the metric to display.
+   * @returns {string} The formatted metric value as a string.
+   */
+  const displayMetric = key => {
+    if (isAverageMetricType(key)) {
+      return formatTime(accountSummary.value[key]);
+    }
+    return Number(accountSummary.value[key] || '').toLocaleString();
+  };
+
+  return {
+    calculateTrend,
+    isAverageMetricType,
+    displayMetric,
+  };
+}