ESM-only, and refresh monolib dependencies

[kvz]

Why:
We can use this dependency refresh as the major-release moment where monolib becomes ESM-only. That lets @transloadit/format-duration-ms move to the current pretty-ms release instead of holding back on the last CommonJS-compatible major, and it keeps the whole internal dependency graph consistent.

What:

• Marked every published workspace package as type: module.
• Raised the supported Node.js floor to 22 in the root and published package metadata.
• Added explicit package exports for published packages while keeping source files on relative .ts imports via TypeScript rewriteRelativeImportExtensions.
• Expanded CI to test Node 22 and Node 24.
• Enabled stricter cheap TypeScript checks: noImplicitOverride, noImplicitReturns, and noFallthroughCasesInSwitch.
• Upgraded root tooling to TypeScript 6.0.3, @types/node 25.9.1, and Biome 2.4.15, including the Biome schema URL.
• Removed unused root dependencies; package-level ownership remains in the workspaces that actually use them.
• Upgraded @transloadit/format-duration-ms to pretty-ms 9.3.0.
• Upgraded @transloadit/post to inquirer 14 using the package's built-in types.
• Replaced remaining substr() usage with slice().
• Fixed the template package tsconfig/import/test so it is built and checked with the repo.
• Refreshed and deduped the Yarn lockfile.
• Added a Changesets major entry for all published monolib packages.

Breaking change:

• Monolib packages are ESM-only and require Node.js 22 or newer. CommonJS consumers should switch to ESM imports or use dynamic import().

Validation:

• corepack yarn install --immutable
• corepack yarn dedupe --check
• corepack yarn check
• corepack yarn npm audit --recursive --all
• package export smoke imports through node_modules
• git diff --check