feat: assistant overview drilldown reports [CW-7408] (#14920)

<img width="2616" height="1716" alt="CleanShot 2026-07-09 at 14 22
42@2x"
src="https://github.com/user-attachments/assets/504e58df-0243-4cb9-a811-62504fdcb0ac"
/>

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Sony Mathew <sony@chatwoot.com>

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

@@ -439,6 +439,13 @@
           "HINT": "Average replies the assistant sends per conversation."
         }
       },
+      "DRILLDOWN": {
+        "CLOSE": "Close details",
+        "EMPTY": "No records found for this metric.",
+        "ERROR": "Could not load records. Please try again.",
+        "LOAD_MORE": "Load more",
+        "RESULT_COUNT_CONVERSATION": "{count} conversation | {count} conversations"
+      },
       "KNOWLEDGE": {
         "TITLE": "Knowledge coverage",
         "COVERAGE": "{pct}% approved",
@@ -446,17 +453,6 @@
         "PENDING": "Pending FAQs",
         "DOCUMENTS": "Documents"
       },
-      "FLAGGED": {
-        "TITLE": "Response quality",
-        "TOTAL": "{count} flagged · {rate}"
-      },
-      "CREDITS": {
-        "TITLE": "Credit usage",
-        "UNIT": "credits",
-        "LEGEND": "Daily credits used",
-        "AXIS_START": "{count}d ago",
-        "AXIS_END": "Today"
-      },
       "LINKS": {
         "DOCS": {
           "TITLE": "Captain docs",
@@ -470,13 +466,6 @@
           "TITLE": "Billing",
           "DESCRIPTION": "Manage credits and plan"
         }
-      },
-      "FLAG_REASONS": {
-        "INCORRECT": "Incorrect info",
-        "INCOMPLETE": "Incomplete",
-        "OUTDATED": "Outdated",
-        "INAPPROPRIATE": "Inappropriate",
-        "OTHER": "Other"
       }
     },
     "ASSISTANT_SWITCHER": {