Han Zheng 354f6a9296 Add README mockups, assets and background support ...

Revamp documentation and add visual assets + background-image support.

- Rewrite README.md and README.zh-CN.md: refreshed intro, feature tour, theme previews, acknowledgements, and minor license text change.
- Add a set of README mockups and styles (assets/readme/{mockups.css,mockups.html} and multiple PNGs) and update overview image.
- Add extension/background-image.js and background-image.test.js, and wire compressImageFileForStorage into extension/app.js (replace old readFileAsDataUrl usage and adjust related file handling). Also simplify drag preview logic by removing previous nav rect tracking/animateNavButtons call. Update extension/index.html and tests (ui-regression.test.js) accordingly.
- Add asset .DS_Store and update repository .DS_Store entry.

Binary image assets and tests were added/updated to support the new docs and background-image workflow.

2026-04-17 08:54:26 +08:00

2.0 MiB

2486x1378px

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