fix(core): fix memory alignment bug causing crash on odd-sized images

[Calebsenm]

• Replaced pixel-based 32-pixel stride alignment with a byte-based 4-byte alignment in generate_linesize_bytes.
• Fixed image distortion (diagonal tearing) and subsequent buffer overflow crashes when importing images with non-standard or odd widths.

Problem

When importing images (like .bmp or .png) with non-standard or odd widths (e.g., 1003px), the preview display showed severe diagonal tearing/distortion, and the application would eventually freeze or crash.

This happened because Frame::generate_linesize_bytes was artificially aligning the pixel width to a multiple of 32 ((width + 31) & ~31). This created a massive mismatch with external libraries like OpenImageIO, which read the exact raw pixels. The resulting stride mismatch caused rows to shift diagonally and led to a buffer overflow when rendering.

Solution

Switched the alignment logic from pixels to bytes (which is the correct approach for hardware/GPU memory padding):

1. Calculate the raw row size in bytes first.
2. Align the final byte count to a 4-byte boundary (row_bytes + 3) & ~3 to keep the GPU happy and match industry standards.

This fully resolves the distortion and eliminates the application freeze when working with arbitrary image resolutions.