What problem does this address?

Users lack a clear, high-impact workflow for image edits like removing objects or extending canvas. Let's build on the existing foundation in #13 to add generative edits that are easy to discover and use.

What is your proposed solution?

Add two image edit actions:

• Inpaint: “Remove or replace area” (aka erase and replace)
• Outpaint: “Extend image” (aka expand canvas and fill)

Add UI entry points:

• Gutenberg-based Media Editor (preferred when available)
• Media Library: Edit Media screen (fallback and parity)

Store results as a new media item while preserving the original image.