chore: update generated tsconfig defaults

[cookesan]

Summary

• update generated .wxt/tsconfig.json compiler defaults to the TS/Bun baseline from Update to lastest recommended TS Config #2449
• keep DOM and DOM.Iterable in the WXT-generated lib list so extension entrypoints keep browser globals without re-adding WebWorker
• refresh TypeScript project e2e snapshots

Fixes #2449

Checks

• bun run --filter wxt test typescript-project
• bun run --filter wxt test run
• bun run --filter wxt check
• bun run --filter wxt-demo postinstall
• bun run --filter wxt-demo check
• packed WXT tarball template validation: react, solid, svelte, vanilla, vue compile/check + build
• bunx prettier --check packages/wxt/src/core/generate-wxt-dir.ts packages/wxt/e2e/tests/typescript-project.test.ts
• git diff --check

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[cookesan]

Rebased onto current main to clear the merge conflict. The resolution keeps upstream’s prepare:tsconfig hook and node_modules exclusion while preserving this PR’s updated compiler defaults.

Local validation:

• bun run test run e2e/tests/typescript-project.test.ts (13 passed, 1 todo)
• bun run check
• git diff --check