Add image upload from URL for speakers and companies

[Copilot]

• Understand the codebase and existing image upload flow
• Modify CreateSpeakerForm.vue to add URL input for image upload
• Modify CreateCompanyForm.vue to add URL input for image upload
• Modify SpeakerInfoForm.vue to add URL input for image upload (edit form)
• Modify CompanyInfoForm.vue to add URL input for image upload (edit form)
• Create reusable ImageUpload component to reduce code duplication
• Create useImageUpload composable for shared logic
• Lint and build the frontend to verify changes
• Run code review and address feedback
• Run codeql_checker - no security vulnerabilities found

Summary

This PR allows users to add photos from a URL instead of having to download and upload from their computer. A tabbed interface with "Upload File" and "From URL" options has been added to the image upload sections of speaker and company forms (both create and edit).

Features

• Users can switch between file upload and URL input modes
• URL validation before fetching
• Content-type validation to ensure URL points to an image
• File size validation (10MB limit)
• Image preview for both file and URL modes
• Loading indicator while fetching image from URL
• Error handling with user-friendly messages

Code Structure

• ImageUpload.vue - Reusable component for image upload with file/URL tabs
• useImageUpload.ts - Composable for shared image upload logic
• Form components now use the shared ImageUpload component to avoid code duplication

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add Photos from Link</issue_title>
<issue_description>When creating speakers or companies instead of having to download the speaker's photo or company's logo just allow users to copy the image's address and upload it that way. e.g. https://sinfo.org/_next/image?url=%2Fimages%2Fevent%2Fabout-us.jpg&w=1200&q=75</issue_description>

<agent_instructions>not a file from the computer a online found image link/url</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Add Photos from Link #510

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[Francisca105]

It would be interesting to add a component to not duplicate code

[Copilot]

It would be interesting to add a component to not duplicate code

Created ImageUpload.vue component and useImageUpload.ts composable to eliminate code duplication. All four forms now use the shared component (fea7b43).

[Francisca105]

LGTM!