docs: add changelog entries for v1.7.0 and v1.7.1

Author: andrew-boyd

_changelog/40.v1.7.0.md

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+## 1.7.0
+
+### December 16, 2025
+
+### 💪 New features
+
+* New Tailwind CSS 4 support — themes now ship with TW4 by default, with TW3 variants available via `regenesis-tw3` and `starter-tw3` theme names
+* CLI now defaults to Tailwind v4 for both Vite and Nuxt project creation with automatic version detection
+* New `minAutoHeight` prop for auto-height textareas that respects CSS minimum height ([#1595](https://github.com/formkit/formkit/pull/1595))
+* New Bengali (bn) locale for internationalization
+* Added `summaryHeader` to all i18n locales for customizing form summary headers
+
+### 🐛 Bug Fixes
+
+* Fixes memory leak by cleaning up `__FORMKIT_CONFIGS__` on unmount
+* Allows passing unix epoch timestamps in `date_between` validation rule ([#1587](https://github.com/formkit/formkit/pull/1587))
+* Fixes validation state becoming invalid when rules are dynamically removed ([#1384](https://github.com/formkit/formkit/issues/1384))
+* Fixes validation dependency tracking issue ([#1371](https://github.com/formkit/formkit/issues/1371))
+* Removes peer dependencies from `@formkit/themes` to avoid version conflicts
+* Fixes Dutch localization terms for next/previous ([#1608](https://github.com/formkit/formkit/pull/1608))
+* Fixes typo in Spanish translation ([#1609](https://github.com/formkit/formkit/pull/1609))
+* Fixes numeric comparison in validation using Math.min/max ([#1620](https://github.com/formkit/formkit/pull/1620))
+* Fixes IIFE build output order ([#1674](https://github.com/formkit/formkit/pull/1674))

_changelog/41.v1.7.1.md

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+## 1.7.1
+
+### December 17, 2025
+
+### 🐛 Bug Fixes
+
+* Shows scrollbars when `maxAutoHeight` has a limit on auto-height textareas
+* Slot scope data now properly shadows outer iteration data with the same variable name in FormKitSchema
+* Adds explicit `FormKitLibrary` type to inputs export for better TypeScript support
+* Fixes Nuxt module issue ([#1690](https://github.com/formkit/formkit/issues/1690))