refactor: Add timers polyfill to DHT package for standalone browser usage

[mondoreale]

Summary

Adds the timers-browserify polyfill to the DHT package, enabling standalone DHT usage in browsers without requiring consumers to manually polyfill setImmediate. The SDK retains its existing polyfill for redundancy.

Changes

• Add timers-browserify dependency to @streamr/dht package
• Add import 'timers' polyfill in DHT's exports.ts for browser compatibility
• Configure timers → timers-browserify alias in DHT's rollup browser config

[Copilot]

Pull request overview

This PR adds browser compatibility to the @streamr/dht package by including a polyfill for setImmediate, which is not natively available in browsers but is used extensively throughout the DHT codebase. The change mirrors the existing approach in the SDK package and enables standalone DHT usage in browser environments without requiring consumers to manually configure polyfills.

Changes:

• Added timers-browserify dependency to @streamr/dht package
• Configured import 'timers' polyfill at the entry point of DHT exports
• Added rollup configuration to alias timers to timers-browserify for browser builds

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/dht/src/exports.ts	Added timers import with explanatory comment at the top of exports to ensure setImmediate is available before any DHT code executes
packages/dht/package.json	Added timers-browserify dependency (^2.0.12) to support browser environments
packages/dht/rollup.config.mts	Added timers→timers-browserify alias for browser builds and applied code formatting improvements
packages/sdk/src/StreamrClient.ts	Minor formatting change (added blank line) for consistency
package-lock.json	Updated lock file to reflect new timers-browserify dependency in DHT package
CHANGELOG.md	Documented the addition of timers-browserify polyfill for standalone browser usage

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