added png extension

[Bharath-Tigergraph]

User description

User description
This change extends TextExtractor.supported_extensions in common/utils/text_extractors.py so .png (image/png) and .gif (image/gif) are recognized alongside existing JPEG handling.

Why: Ingestion and downstream processing rely on this map to treat uploads as supported image types. Without these entries, PNG (and GIF) files could be mishandled or rejected even when image extraction paths are otherwise correct.

Scope: Adds two MIME mappings only; no behavioral changes elsewhere in the module.

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PR Type

Bug fix, Enhancement

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Description

• Add PNG and GIF MIME mappings

• Expand supported image types in extractor

• Prevent rejection of PNG and GIF uploads

• No changes to processing logic

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Diagram Walkthrough

flowchart LR
  A["TextExtractor.__init__"] -- "extend `supported_extensions`" --> B["Add .png and .gif MIME types"]
  B -- "enables" --> C["PNG/GIF upload recognition"]

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File Walkthrough

	Relevant files
Enhancement	text_extractors.py Add PNG and GIF MIME mappings                                                        common/utils/text_extractors.py Map '.png' to 'image/png' Map '.gif' to 'image/gif' Extend supported_extensions dictionary +2/-0

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⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Edge Case Verify that file extension lookups are case-insensitive (e.g., '.PNG', '.Gif'). If normalization to lowercase is not guaranteed elsewhere, consider lowercasing inputs or adding a normalization step to avoid missed matches. '.png': 'image/png', '.gif': 'image/gif',

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