[Quick Fix] Update gitignore and add temp fix for devs logging in

[RyanCheung555]

Overview

• Update gitignore
• Add temp fix for devs logging in

Changes Made

• Update git ignore to include DS_Store files and make it handle files like google-services.json more cleaner
• Add a temporary fix to route user to onboarding flow when encountering a user not found error

Test Coverage

• Tested on Medium Phone, signing in may require interacting with firebase if something that is not a 403 http error occurs

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: 4527d134-6353-47fb-a433-524b61424f1a

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[RyanCheung555]

Quick fix, will come back to this issue in the future if production also has broken login