build: adopt TypeScript 7.0.2

[MounirDhahri]

Description

Retry of the earlier TS7 attempt (#23), now unblocked by the Yarn 4.17 upgrade. Yarn 4.17 restricts its builtin compat/typescript patch to TS < 7, so the TS7 native compiler installs cleanly instead of failing on the removed lib/_tsc.js.

Bumps typescript 5.9.2 → 7.0.2 for much faster type-checking.

CI is the gate: yarn tsc must pass under the TS7 native compiler and yarn lint must still work (i.e. @typescript-eslint/parser 5.57 parses under TS7 — it version-warns but shouldn't hard-fail).

PR Checklist

• Dependency bump only; no app code or UI change

🤖 Generated with Claude Code

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Generated by Claude Code

[artsyit]

	Warnings
⚠️	Changes were made to package.json, but not to yarn.lock. Perhaps you need to run yarn install?

Generated by 🚫 dangerJS against 127d24e

[MounirDhahri]

Closing for now per maintainer — deferring the TypeScript 7 upgrade.

For the record, it's blocked on tooling, not code: Yarn 4.17.0 still force-applies its builtin compat/typescript patch to TS7 and fails during install (ENOENT … typescript/lib/_tsc.js, removed in the native compiler). Revisit once Yarn ships berry#7190 (limits the patch to TS < 7) or with a known workaround. Staying on TypeScript 5.9.2.

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