chore(deps): upgrade all dependencies to latest major versions

[happy-haki]

Dependency Upgrades

Dependencies

Package	From	To
@radix-ui/react-accordion	^1.2.12	^1.2.13
next	^16.2.6	^16.2.7
react	^16.2.6	^19.2.7
react-dom	^19.2.6	^19.2.7

Dev Dependencies

Package	From	To
@biomejs/biome	^2.4.15	^2.4.16
@next/mdx	^16.2.6	^16.2.7
@types/mdx	^2.0.13	^2.0.14
@types/node	^25.8.0	^25.9.2
@types/react	^19.2.14	^19.2.17
lint-staged	^17.0.5	^17.0.7
shiki	^4.0.2	^4.2.0
ultracite	^7.7.0	^7.8.2

Tooling

Package	From	To
pnpm (packageManager)	10.34.1	11.5.2

Additional Changes

• Migrated pnpm.overrides from package.json to pnpm-workspace.yaml (required by pnpm v11)
• Created pnpm-workspace.yaml with allowBuilds and overrides config

Verification

• ✅ pnpm install succeeds
• ✅ pnpm build succeeds (Next.js 16.2.7, Turbopack)

Closes #116 (supersedes the renovate pnpm v11 upgrade PR)

[coauthors]

People can be co-author:

Candidate	Reasons	Count	Add this as commit message
@happy-haki	#133	1	Co-authored-by: happy-haki <266456141+happy-haki@users.noreply.github.com>

[netlify]

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[gemini-code-assist]

Code Review

This pull request updates several dependencies and devDependencies in package.json, upgrades the package manager to pnpm v11.5.2, and introduces a pnpm-workspace.yaml configuration file. Feedback on the changes identifies an issue in pnpm-workspace.yaml where the deprecated or incorrect allowBuilds field is used instead of onlyBuiltDependencies to enable builds for the sharp package, which could lead to build or runtime failures in Next.js.

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[gemini-code-assist]

In pnpm v10 and v11, the configuration to allow builds for specific dependencies is onlyBuiltDependencies (which accepts an array of package names), rather than allowBuilds with boolean values. Using allowBuilds will be ignored by pnpm, which will prevent sharp from building and potentially cause runtime or build issues in Next.js.

onlyBuiltDependencies:
  - sharp