Migrate to @playcanvas/eslint-config v3 (/typescript)

[kpal81xd]

Part of the v3 rollout — playcanvas/eslint-config#48.

Changes

• Subpath migration: replaced the v2 default-import spread with the dedicated subpath
  config: import typescriptConfig from '@playcanvas/eslint-config/typescript' and
  export default [...typescriptConfig, ...overrides].
• Removed redundant manual wiring: the old config hand-wired the TS parser/plugin and
  spread tsPlugin.configs.recommended.rules, plus an import/resolver settings block.
  The /typescript config now provides the @typescript-eslint parser+plugin
  (recommended/strict/stylistic), the import-x resolver, jsdoc, and package-json rules,
  so all of that was dropped.
• import/* → import-x/* namespace: renamed the eslint-disable import/order directive
  in src/index.ts to import-x/order. Dropped the manual import/resolver settings block.
• Dropped now-defunct jsdoc/* overrides (require-param-type, require-returns-type).
• Kept genuine overrides: browser globals for examples/**/*.mjs and the **/*.ts
  block's browser + custom globals (AddEventListenerOptions, EventListener,
  EventListenerOptions), and the project's @typescript-eslint/* off suppressions
  (ban-ts-comment, no-explicit-any, no-unused-vars).

Version bump

• Pinned @playcanvas/eslint-config to exactly 3.0.0-beta.5 (carries the import-x
  resolver fix). Regenerated package-lock.json.

devDep cleanup

Removed direct devDeps now bundled transitively by /typescript:

• @typescript-eslint/eslint-plugin
• @typescript-eslint/parser
• eslint-import-resolver-typescript

(globals kept — still referenced directly in eslint.config.mjs overrides.)

Lint result

Ran an auto-fix pass (eslint ... --fix): 102 errors + 5 warnings auto-fixed
(113/5 → 11/0). Auto-fixes were consistent-type-imports (import type), array-type
(Array<T> → T[]), redundant type-annotation removal, and import-x/order reordering.
tsc --noEmit and rollup -c both pass after the fixes.

11 residual errors remain (not hand-fixed — pre-existing genuine findings):

Rule	Count	Sample
@typescript-eslint/no-unused-vars	8	examples/assets/scripts/camera-feed.mjs:84
@typescript-eslint/no-empty-function	1	src/components/component.ts:44
no-prototype-builtins	1	src/components/particlesystem-component.ts:55
@typescript-eslint/consistent-type-definitions	1	src/components/script-component.ts:21

Note: in examples/js/example.mjs the auto-fixer removed a now-unused
eslint-disable-next-line no-unused-vars directive (the active rule is now the
@typescript-eslint/* variant), leaving a stray-whitespace line. Harmless; left as-is
to keep the auto-fix pass unmodified.

Opened as a draft pending decisions on the residual findings above.