IS-11176: Fix prettier config and apply formatting

[aleixsuau]

Summary

• Applied the SSP's prettier config
• Applied prettier formatting to 6 source files that were not conforming to the project config (indentation, trailing whitespace, line wrapping, missing newlines at EOF)

Test plan

• Verify npx prettier --check passes on all LWA source files
• Confirm CI build and lint pass

[Copilot]

Pull request overview

This PR updates the Login Web App’s Prettier configuration to make formatting deterministic, then applies Prettier formatting across several files so they conform to the project’s style rules.

Changes:

• Add explicit tabWidth: 2 to the Login Web App’s .prettierrc.
• Apply Prettier-driven formatting/whitespace cleanup across CSS, TSX source, and tests.
• Normalize file endings (eg, newline at EOF).

Reviewed changes

Copilot reviewed 5 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/login-web-app/src/shared/util/css/styles.css	Prettier formatting applied to nested/extended CSS rules.
src/login-web-app/src/shared/feature/error-handling/default-error-fallback.tsx	Prettier formatting of error fallback component.
src/login-web-app/src/haapi-stepper/feature/stepper/HaapiStepperErrorNotifier.tsx	Minor whitespace cleanup.
src/login-web-app/src/haapi-stepper/feature/stepper/HaapiStepperErrorNotifier.spec.tsx	Prettier wrapping/formatting in tests.
src/login-web-app/src/haapi-stepper/feature/stepper/HaapiStepper.tsx	Prettier formatting (including JSX return compacting).
src/login-web-app/src/haapi-stepper/feature/stepper/HaapiStepper.spec.tsx	Trailing whitespace removal.
src/login-web-app/package.json	Formatting/newline normalization at EOF.
src/login-web-app/.prettierrc	Add tabWidth: 2 to avoid config inheritance conflicts.

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