feat: add bulk invoice export

[Thushara3005]

Description

Fixes #162

This PR adds bulk invoice export functionality to the Sent and Received invoice pages.

Previously, invoices could only be exported individually. This change allows users to select multiple invoices and export them together in CSV, JSON, or PDF format.

What's included

• Added invoice selection for bulk exports.
• Added support for CSV, JSON, and PDF formats.
• Added Single File export option.
• Added Separate Files (ZIP) export option.
• Multiple PDF invoices can now be combined into a single PDF.
• Added ZIP generation for exporting invoices as separate files.
• Reused the existing invoice export functionality where possible.
• Added jszip and pdf-lib dependencies.
• Kept bulk export selection independent from the existing batch payment selection.

Export options

Formats:

• CSV
• JSON
• PDF

Modes:

• Single File — exports all selected invoices into one file.
• Separate Files — creates individual invoice files and downloads them together as a ZIP.

Testing

The following were tested with multiple invoices:

• CSV bulk export
• JSON bulk export
• PDF bulk export
• Separate files ZIP export
• Merged PDF export
• Frontend production build

Closes #162

[coderabbitai]

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​jszip@​3.10.1
	npm/​pdf-lib@​1.17.1

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: npm pdf-lib is 75.0% likely obfuscated Confidence: 0.75 Location: Package overview From: frontend/package.json → npm/pdf-lib@1.17.1 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/pdf-lib@1.17.1. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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[Thushara3005]

Hi, the implementation is ready for review. The PR currently has no merge conflicts, and the available checks have passed. One workflow is awaiting maintainer approval because this PR comes from a fork.