[CORE-8379] Upgrade to Ionic 9 to fix ARIA initialization

[trtshen]

Story/Ticket Reference ID from JIRA:
CORE-8379

Additional Comments:
Upgrade Ionic Angular/Core from 8.8.1 to 9.0.5 to resolve the button ARIA initialization error using Ionic's upstream fix. Preserve NgModules through @ionic/angular/lazy, retain Vite exclusions, correct the typed textarea input event, and align Safari/iOS targets with Ionic 9. No CJS vendor patch or lifecycle/Docker/CI patching is included.

Checklist:

• Real Ionic ARIA regression and Safari reproduction pass; accessibility attributes still update.
• Type checks, request/development builds and development startup verified.
• Full suite: 1,602 pass, the exact same 32 baseline failures.
• Migration notes added in docs/upgrades/ionic-8-to-9.md.
• Authenticated smoke: home/settings/avatar, uploads, assessment auto-save/layout, navigation and overlays.

Production-mode compilation with a local configuration fixture still fails the same seven budget checks as the base; no budgets were relaxed. Docker's running app remains on Ionic 8. This PR targets login-refactor and needs authenticated acceptance before merge.