refactor: reduce bundle size via dead code removal and log shortening

[fadi-george]

Description

1 Line Summary

Reduce SDK bundle size by removing unused code, simplifying helpers, shortening debug messages, and removing legacy v16 beta worker fallback.

Details

Series of refactors targeting gzipped bundle size:

• Shortened debug log messages across the codebase
• Removed unused helper functions (context/helpers.ts deleted, dom.ts simplified)
• Simplified DOM helper functions
• Removed v16 beta worker fallback logic from the service worker
• Updated size-limit thresholds to reflect the savings

Size Limit Changes

Bundle	main	This branch	Diff
OneSignalSDK.page.es6.js	43.69 kB	41.96 kB	-1.73 kB (-3.96%)
OneSignalSDK.sw.js	12.701 kB	12.29 kB	-0.411 kB (-3.24%)

Net reduction of ~2.14 kB gzipped across the two main bundles.

Systems Affected

• WebSDK
• Backend
• Dashboard

Validation

Tests

Info

Updated existing unit tests to match shortened debug messages. No behavioral changes, only refactoring.

Checklist

• All the automated tests pass or I explained why that is not possible
• I have personally tested this on my machine or explained why that is not possible
• I have included test coverage for these changes or explained why they are not needed

Programming Checklist
Interfaces:

• Don't use default export
• New interfaces are in model files

Functions:

• Don't use default export
• All function signatures have return types
• Helpers should not access any data but rather be given the data to operate on.

Typescript:

• No Typescript warnings
• Avoid silencing null/undefined warnings with the exclamation point

Other:

• Iteration: refrain from using elem of array syntax. Prefer forEach or use map
• Avoid using global OneSignal accessor for context if possible. Instead, we can pass it to function/constructor so that we don't call OneSignal.context

Screenshots

Info

N/A, no UI changes.

Checklist

• I have included screenshots/recordings of the intended results or explained why they are not needed

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