fix: astro check failure

[JoeyC-Dev]

Type of change

• Bug fix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please describe):

Checklist

• I have read the CONTRIBUTING document.
• I have checked to ensure that this Pull Request is not for personal changes.
• I have performed a self-review of my own code.
• My changes generate no new warnings.

Related Issue

Fix: #722

Changes

1. Fix type compatibility in ArchivePanel.svelte by updating category to accept string | null.
2. Add @ts-ignore for LightDarkSwitch client directive in Navbar.astro.
3. Rename unused parameter in language-badge.ts to suppress warning.
4. Add required props to ArchivePanel in archive.astro. (required after applying fix 1)

Resolved errors/warnings:

src/pages/archive.astro:12:19 - error ts(2322): Type 'PostForList[]' is not assignable to type 'Post[]'.
  Type 'PostForList' is not assignable to type 'Post'.
    The types of 'data.category' are incompatible between these types.
      Type 'string | null' is not assignable to type 'string | undefined'.
        Type 'null' is not assignable to type 'string | undefined'.

12     <ArchivePanel sortedPosts={sortedPostsList} client:only="svelte"></ArchivePanel>

src/components/Navbar.astro:54:14 - error ts(2322): Type '{ "client:only": string; }' is not assignable to type 'IntrinsicAttributes & Record<string, never>'.
  Type '{ "client:only": string; }' is not assignable to type 'Record<string, never>'.
    Property 'client:only' is incompatible with index signature.
      Type 'string' is not assignable to type 'never'.

54             <LightDarkSwitch client:only="svelte"></LightDarkSwitch>

src/plugins/expressive-code/language-badge.ts:10:16 - warning ts(6133): '_cssVar' is declared but its value is never read.

10   baseStyles: ({ _cssVar }) => `

src/pages/archive.astro:12:6 - error ts(2322): Type '{ sortedPosts: PostForList[]; "client:only": string; }' is not assignable to type 'IntrinsicAttributes & { tags: string[]; categories: string[]; sortedPosts?: Post[] | undefined; } & { $$events?: { [evt: string]: CustomEvent<any>; } | undefined; $$slots?: {} | undefined; }'.
  Type '{ sortedPosts: PostForList[]; "client:only": string; }' is missing the following properties from type '{ tags: string[]; categories: string[]; sortedPosts?: Post[] | undefined; }': tags, categories

12     <ArchivePanel sortedPosts={sortedPostsList} client:only="svelte"></ArchivePanel>

How To Test

See the Astro Check result of this PR.

Screenshots (if applicable)

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