chore(deps): remove unused frontend dependencies

[SuyashJain17]

Proposed change

Resolves #3142

Summary

This PR removes unused frontend dependencies after verification.

Details

• Removed rxjs from frontend/package.json as it is not imported or used anywhere in the codebase or tests.
• Removed @types/react-gtm-module after confirming there are no references to Google Tag Manager and the runtime package is not present.
• Updated pnpm-lock.yaml accordingly using the repository-specified pnpm version.

This change is limited to dependency cleanup and does not affect application behavior.

Checklist

• Required: I read and followed the contributing guidelines
• Required: I ran dependency installation locally and verified the frontend setup after the change
• I used AI for guidance during investigation and verification; all changes were reviewed and applied manually

[coderabbitai]

Summary by CodeRabbit

• Chores
  • Removed unused dependencies from project configuration to streamline development and reduce maintenance requirements.

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Walkthrough

Removed two unused dependencies from the frontend package configuration: rxjs from production dependencies and @types/react-gtm-module from development dependencies. No code or exported declarations were modified.

Changes

Cohort / File(s)	Summary
Dependency cleanup frontend/package.json	Removed unused rxjs dependency and unused @types/react-gtm-module dev dependency with no active codebase references

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Pre-merge checks and finishing touches

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change—removing unused frontend dependencies from package.json.
Description check	✅ Passed	The description is directly related to the changeset, providing detailed explanations of which dependencies were removed and why, along with verification steps.
Linked Issues check	✅ Passed	The PR successfully addresses all requirements from issue #3142: both rxjs and @types/react-gtm-module have been removed from frontend/package.json with appropriate verification steps completed.
Out of Scope Changes check	✅ Passed	All changes are scoped to dependency cleanup in frontend/package.json and pnpm-lock.yaml, with no unrelated modifications introduced.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

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Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between dfc2bf0 and bde4d4d.

⛔ Files ignored due to path filters (1)

• frontend/pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (1)

• frontend/package.json

💤 Files with no reviewable changes (1)

• frontend/package.json

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[arkid15r]

LGTM