Speed-up TypeScript by moving to tsgo

[ai]

1. Use separated TS settings for each projects since they have different environments and global types
2. Move to tsgo for .ts files
3. Use svelte-fast-check for `.svelte files

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​typescript/​native-preview@​7.0.0-dev.20260103.1
	svelte-fast-check@​0.2.2

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