feat: bring resizable image back to editor

[devin-ai-integration]

Summary

Brings back resizable image support in the tiptap editor, as described in #3327. This uses the ResizableNodeView API from @tiptap/core v3.x to add drag-to-resize handles on images.

Key changes:

• packages/tiptap/src/shared/extensions/index.ts: Adds width/height attributes to AttachmentImage, implements a custom addNodeView() using ResizableNodeView with resize/commit callbacks, adds extractAttachmentIdFromSrc() helper for parseMarkdown, and enables resize with all 8 directions.
• packages/tiptap/src/styles/base.css: Adds position: relative on .node-image, a global img { display: block } rule inside .tiptap, and CSS for all resize handle variants (corners + edges) with appropriate cursors.

Review & Testing Checklist for Human

• Test image resizing end-to-end: Drop/paste an image into the editor and verify resize handles appear and dragging them resizes the image correctly. Check that resized dimensions persist after blur/re-focus.
• Verify onCommit with multiple images: editor.commands.updateAttributes("image", ...) targets the currently selected node — confirm that resizing one image doesn't affect dimensions of other images in the same document.
• Check addNodeView() returning null: When resize is disabled or not configured (e.g. via options.imageExtension), the method returns null. Verify tiptap handles this gracefully and falls back to the default image rendering.
• Review broad img { display: block } rule: This applies to all img tags inside .tiptap — confirm it doesn't break non-image-node images or inline image use cases.
• Test extractAttachmentIdFromSrc regex: Verify it correctly extracts UUIDs from your actual attachment URLs and returns null for non-attachment URLs (e.g. external image links).

Notes

• Closes Bring resizable image back to editor (?) #3327
• The diff follows the exact changes proposed in the issue.
• Requested by @ComputelessComputer
• Link to Devin run

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[devin-ai-integration]

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