[Hrafngud]

Summary

Add optional image thumbnails to autocomplete suggestions, making image-heavy reference libraries easier to browse.

• Use the format registry to recognize every supported image extension, including BMP.
• Resolve thumbnails only for TFiles inside the current vault, using Obsidian's vault.getResourcePath(); keep the existing text row when resolution fails.
• Keep the option off by default, use a 48px thumbnail, and expose its size through Style Settings / --reference-linker-thumbnail-size.
• Leave the shared submodule, indexing, and link generation unchanged.

Verification

• npm test — 1,092 passed
• npm run test:core — 17 passed
• npm run build — generated main.js and styles.css committed
• Manually tested SVG suggestions in Obsidian

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That's how it looks like: