blog: introducing window state persistence

[nilayarya]

Description of Change

GSoC 2025 blog post.

[nilayarya]

@georgexu99 @erickzhao @VerteDinde @dsanders11 I'll set this to ready once the feature gets merged.

[ckerr]

Minor lint warnings

blog/introducing-window-state-persistence.md:67 MD032/blanks-around-lists Lists should be surrounded by blank lines [Context: "2. Inside Settings->Execution,..."]
blog/introducing-window-state-persistence.md:88:1 MD053/link-image-reference-definitions Link and image reference definitions should be needed [Unused link or image reference definition: "erickzhao"] [Context: "[erickzhao]: https://github.co.../"]
blog/introducing-window-state-persistence.md:89:1 MD053/link-image-reference-definitions Link and image reference definitions should be needed [Unused link or image reference definition: "vertedinde"] [Context: "[VerteDinde]: https://github.c.../"]
blog/introducing-window-state-persistence.md:90:1 MD053/link-image-reference-definitions Link and image reference definitions should be needed [Unused link or image reference definition: "dsanders11"] [Context: "[dsanders11]: https://github.c.../"]
blog/introducing-window-state-persistence.md:91:1 MD053/link-image-reference-definitions Link and image reference definitions should be needed [Unused link or image reference definition: "georgexu99"] [Context: "[georgexu99]: https://github.c.../"]