fix(filters): inline FiltersButton props to avoid nuxt 4.4.6 SFC regression

[benjamincanac]

Summary

Follow-up to #56. After fixing ChatPrompt, renovate's nuxt 4.4.6 bump (#54) still fails on Vercel, this time on FiltersButton.vue:

```
[vite:vue] [@vue/compiler-sfc] Failed to resolve import source "vue-chrts/types".
.nuxt/types/imports.d.ts:515
export type { BulletLegendItemInterface, ... } from 'vue-chrts/types'
file: app/components/filters/FiltersButton.vue
```

Same regression class: nuxt 4.4.6's bundled @vue/compiler-sfc follows external type chains more aggressively when resolving defineProps<ExternalType & {...}> / defineProps<Pick<ExternalType, ...> & {...}>, tripping over nuxt-charts's auto-imported vue-chrts/types source (which has no runtime export).

Switch FiltersButton to inline props with indexed-access types (ButtonProps['color'] etc.) — keeps type-safety without forcing the SFC compiler to flatten ButtonProps.

Reproduced locally on nuxt@4.4.6; with this change pnpm build + pnpm typecheck are both green.

Test plan

• Reproduced original failure locally with pnpm add nuxt@4.4.6.
• pnpm build and pnpm typecheck pass with the fix on nuxt@4.4.6.
• CI green on this PR.
• After merge, renovate's PR chore(deps): update dependency nuxt to ^4.4.6 #54 rebases and Vercel build passes on nuxt@4.4.6.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 022b375 and c737df4.

📒 Files selected for processing (1)

• app/components/filters/FiltersButton.vue

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/nuxt-4.4.6-sfc-extends-regression

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