chore: update eslint to v10 and adopt @ionic/eslint-config

[ItsChaceD]

Description

Updates eslint to v10 and moves this repo onto @ionic/eslint-config 0.5.0.

The config here was hand-written and mostly a copy of the shared ionic rule set, so it's replaced with the shared config. The ignore list is kept as it was, plus .js files so we're linting the same thing as before. That drops most of the config file.

Change Type

• Fix
• Feature
• Refactor
• Breaking Change
• Documentation
• Other (CI, chores, etc.)

Rationale / Problems Fixed

https://outsystemsrd.atlassian.net/browse/RMET-4734

Eslint 9 is end of life as of August 2026. Adopting the shared config while we're already in here means we don't change the lint setup twice back to back, and rule changes now come from one place instead of being copied into each repo.

Platforms Affected

• Android
• iOS
• Web

Notes

Needs @ionic/eslint-config@0.5.0 published first. Run npm install to update the lockfile.