fix(app): update browser favicon to new Vibe V logo | ID-502

[ldparker]

Summary

• Replaces the browser tab favicon with the updated Later Vibe V logo
• Adds vibe-favicon.png to the app public directory
• Updates index.html icon link references to point to the new image

Linear

Resolves ID-502

Test plan

• Verify the new V logo appears in the browser tab when running the app locally

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The following comment was made by an LLM, it may be inaccurate:

[RashaZayed]

@ldparker We’re using the later/customizations branch. Could you update the PR to target that instead of dev?

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