build(deps): upgrade typescript to 5.9.3

[Ilanaya]

Changes

• TypeScript & internals upgrade — typescript bumped to 5.9.3, ts-expose-internals to 5.6.3
• Explicit ts imports across ~80 files — Every plugin source file now has an explicit import * as ts from 'typescript/lib/tsserverlibrary' instead of relying on the old ambient global. The old ts.d.ts is deleted
• Reworked globals typings — globals.d.ts rewritten to use a proper declare global {} block, making the ambient/global boundary explicit and compatible with TS 5.9
• ESLint rule change — @typescript-eslint/no-restricted-imports rule that banned typescript* imports removed, since direct imports are now the intended pattern

Notes

• Build size wasn't changed:

* No changes in user facing features were made

[zardoy]

merge if its ready to merge