fix(web): provide exact PWA icon sizes for Windows notifications

[techotaku39]

Problem / Motivation

On Windows 10, an Edge-installed HAPI PWA uses the PWA application icon for the small identity icon in notification toasts. The manifest did not provide sufficiently small exact-size resources, so Windows/Edge downscaled a larger icon and the identity icon appeared blurry.

The larger notification body icon was already clear and is not changed by this PR.

Summary

• Add 16x16, 24x24, 32x32, and 48x48 PNG PWA icon assets.
• Advertise the new exact sizes in the Vite PWA manifest while retaining the existing 64x64, 192x192, and 512x512 assets.
• Leave notification payloads, Service Worker behavior, and the body icon unchanged.

Validation

• bun typecheck
• pwsh -NoProfile -File .\scripts\Invoke-HapiTaskPlaywright.ps1 -Name pwa-notification-icon -Suite Root -TestArgs terminal-wrap-fidelity.spec.ts — 2 passed
• bun run test:web — 264 files, 2,555 tests passed
• bun run build — passed
• Manual Windows 10 + Edge validation with a fresh PWA installation and a real Web Push notification confirmed that the top-left identity icon is sharp while the body icon remains sharp.
• Deployed manifest and icon resources returned HTTP 200.

Impact / Risk

• No notification logic or data format changes.
• Existing installed PWAs may need to be reinstalled or refreshed because Edge caches PWA icons.

Related Issues

Fixes #1622

AI Disclosure

OpenAI Codex assisted with the implementation, validation, and PR drafting.

[github-actions]

Findings

• None.

Summary

• Review mode: initial. No correctness, security, regression, data-loss, performance, or maintainability issues found in the latest diff. Residual risk: Windows/Edge notification identity-icon selection and installed-PWA icon-cache refresh are platform-specific; no automated manifest/icon-dimension assertion was found around web/vite.config.ts:105.

Testing

• Not run (automation). GitHub integration passed; test was pending at review time. The four PNG dimensions and manifest declarations were inspected directly.

HAPI Bot