Make the default image filename more generic

[mrubens]

Important

Change default image filename to a more generic format in saveImage() function in image-handler.ts.

• Behavior:
  • Change default image filename from mermaid_diagram_<timestamp> to img_<timestamp> in saveImage() function in image-handler.ts.

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[roomote]

Thank you for your contribution! The change from mermaid_diagram_ to img_ makes perfect sense since the saveImage function is generic and handles all types of images, not just Mermaid diagrams. This also improves consistency with the openImage function which uses temp_image_ as a prefix.

A few additional observations about the module:

• The module currently lacks test coverage. Consider adding unit tests for both openImage and saveImage functions to ensure they handle various scenarios correctly.
• JSDoc documentation would improve code maintainability by explaining the purpose and parameters of these functions.

[roomote]

Good change! The generic img_ prefix is more appropriate since this function saves any type of image, not just Mermaid diagrams.

Have you considered making this prefix configurable? Something like:

Suggested change

	const defaultFileName = `img_${Date.now()}.${format}`
	const defaultFileName = `${options?.filenamePrefix || 'img'}_${Date.now()}.${format}`

This would allow callers to specify context-appropriate prefixes (e.g., "screenshot_", "diagram_") while maintaining "img_" as the default.