feat(broadcast): add LinkedIn footer social icon

[waleedlatif1]

Summary

• Add linkedin-icon.png (32×32, transparent, #757575) to apps/sim/public/static/, completing the social icon set used in email broadcast footers alongside the existing X / GitHub / Discord icons
• Generated from the in-repo LinkedInIcon glyph and color-matched to the other footer icons; serves at https://sim.ai/static/linkedin-icon.png, which the overview newsletter footer references

Type of Change

• New asset

Testing

Verified the rendered PNG matches the other footer icons — 32×32, transparent background, #757575 glyph, comparable opaque-pixel weight

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Jun 30, 2026 8:46pm

[cursor]

PR Summary

Low Risk
Static image-only change with no application logic, auth, or data handling impact.

Overview
Adds linkedin-icon.png under apps/sim/public/static/, alongside the existing X, GitHub, and Discord footer PNGs used in email broadcast footers.

The asset is a 32×32, transparent #757575 glyph aligned with the other footer icons (derived from the in-repo LinkedInIcon), and is served at https://sim.ai/static/linkedin-icon.png for templates such as the overview newsletter footer that link to Sim’s LinkedIn presence.

^{Reviewed by Cursor Bugbot for commit dc41b26. Configure here.}