[42/44] Enable TS strict mode in portlets-edit-ema-portlet

Description

Part of the strict-mode rollout epic #35932. Enable TypeScript strict mode for the portlets-edit-ema-portlet project using typescript-strict-plugin.

• Dependency layer: 9 (0 = leaf library, 10 = top-level app)
• Internal dependents: 1 project(s)
• Rollout order: 42 / 44
• Note: Heaviest portlet (18 internal deps).

All internal dependencies of portlets-edit-ema-portlet should already be in strict mode before starting (they appear earlier in the rollout order).

Acceptance Criteria

• portlets-edit-ema-portlet's src is added to the typescript-strict-plugin strict paths config.
• All resulting type errors are resolved (no new any; use explicit types).
• // @ts-strict-ignore is used only where unavoidable, each with a follow-up TODO.
• yarn nx run portlets-edit-ema-portlet:lint passes (and :build / :test where applicable).
• npx tsc-strict passes for portlets-edit-ema-portlet.
• yarn nx affected -t build does not break dependents.

Priority

Medium

Additional Context

One project in the bottom-up rollout tracked by epic #35932. Depends on the bootstrap task being merged and on lower-layer projects already being strict.

Start with the typescript-strict-plugin strict paths configuration and the portlets-edit-ema-portlet src tree. Add the project to strict mode, resolve resulting type errors without new any values, and use ts-strict-ignore only with follow-up TODOs. Run the project's lint, build, test, npx tsc-strict, and affected build commands to verify completion.