Fix: agent application can not show Cite

[zpf121]

Close #14018

What problem does this PR solve?

Briefly describe what this PR aims to solve. Include background context that will help reviewers understand the purpose of the PR.

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

Problem

In Agent applications, even with the cite option enabled, only inline [ID: x] citation markers are visible (showing chunk content on hover). The Agent does not display the referenced file cards below the response, unlike Chat applications.

Root Cause

The Agent's Retrieval tool (agent/tools/retrieval.py) calls retriever.retrieval() with aggs=False, which means the retrieval results do not include doc_aggs (document aggregation) data. Without doc_aggs, the frontend ReferenceDocumentList component has no data to render the file cards.

In contrast, the Chat application (api/db/services/dialog_service.py) calls the same retriever.retrieval() method with aggs=True.

Fix

Changed aggs=False to aggs=True in agent/tools/retrieval.py so that document aggregation data is returned along with the retrieved chunks.

[coderabbitai]

📝 Walkthrough

Walkthrough

A single parameter modification in the retrieval tool that enables aggregations during metadata-filtered dataset searches. The aggs argument in settings.retriever.retrieval() changes from False to True, resulting in aggregation-related data being included in the retrieval output.

Changes

Cohort / File(s)	Summary
Retrieval Aggregation Enhancement agent/tools/retrieval.py	Modified _resolve_manual_filter function to request aggregations by changing the aggs parameter from False to True in the retrieval call, altering the output structure to include aggregation results.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A single tweak, a toggle flipped with care,
Aggregations bloom from data thin air,
No public walls were moved, just whispers inside,
The retrieval streams now richer, wider, and wide! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly addresses the main issue: Agent applications cannot show citations, which matches the root cause and fix described in the PR.
Description check	✅ Passed	The pull request description is comprehensive and well-structured, following the template with clear sections including problem statement, root cause analysis, and the specific fix applied.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.66%. Comparing base (462be53) to head (cfecc6a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14047   +/-   ##
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  Coverage   96.66%   96.66%           
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  Files          10       10           
  Lines         690      690           
  Branches      108      108           
=======================================
  Hits          667      667           
  Misses          8        8           
  Partials       15       15           

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