fix: add missing cover image for password-generator

[saatvik-10]

Problem

The Password Generator project was displaying a broken image icon in the Trending Plays section.

Root Cause

• External image URL: https://securityintelligence.com/wp-content/uploads/2018/10/si-eight-character-password-feature.jpg
• This URL redirects to IBM security page and is no longer accessible as an image

Solution

• Added local cover.png as fallback following existing pattern
• The loadCoverImage utility will now find the local file when external URL fails

Testing

• Verified cover.png exists and is valid PNG format
• Follows same structure as other plays (analog-clock, etc.)

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[priyankarpal]

still it's visible

[saatvik-10]

still it's visible

Enhanced Image Loading Logic

• Modified PlayThumbnail.jsx to properly handle external image loading failures
• Before: if (play.cover) use external, else use local
• After: try external image → if fails → fallback to local image
• Added proper error handling with Image() constructor to detect load failures