v6.5.0
[website] Remove Octopus as diamond sponsor (#45782) (#45948)
[docs] Link Toolpad core docs to the docs menu (#42952)
[core] Fix double redirection to Base UI (#45146)
[docs] Update release schedule table after v6 stable (#43726)
[material-ui] Refine `extendTheme` and `CssVarsProvider` API (#42839)
[material-ui][mui-system] Stabilize Grid v2 and deprecate Grid v1 (#43054)
[docs-infra] Fix RTL dark mode (#41803)
[website] Add banners and notification for 2025 Developer Survey (#45280) (#45282)
[Button] Add `loading` prop (#44637)
[docs] Fix broken links to MUI X docs (cherry-pick of #45145) (#45481)
[website] Add no-op service worker to fix stale cache issue (#37607)