fix(utilities): require dot prefix in has_image_extension checks

[laurigates]

Summary

has_image_extension() uses endswith(("png", "jpg", "jpeg")) without dot prefixes, so any path ending in those letters matches (e.g., notapng → True).

This adds the . prefix to each extension tuple entry so only actual file extensions match.

Changes

• modules/utilities.py: Add . prefix to extension strings in has_image_extension()

Testing

• has_image_extension("photo.png") → True (unchanged)
• has_image_extension("notapng") → False (was incorrectly True)
• has_image_extension("file.jpg") → True (unchanged)

🤖 Generated with Claude Code

Summary by Sourcery

Bug Fixes:

• Ensure has_image_extension() only matches real file extensions (e.g., .png, .jpg, .jpeg) instead of any path ending with those letter sequences.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the image file extension check in utilities to require a leading dot so only real file extensions are matched, not arbitrary trailing characters.

File-Level Changes

Change	Details	Files
Tighten image extension detection to match only real file extensions with a leading dot.	Change has_image_extension to call endswith with extensions including a leading '.' for png, jpg, and jpeg Preserve case-insensitive behavior by continuing to lower() the input path before checking extensions	modules/utilities.py

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