Restored user's node to ui (messages/node list)

[danditomaso]

Description

This PR restore the users own node to both the messages screen and the node list. There has been debate if it should be listed and this PR has determined going forwards all nodes including the node you are connected to will be visible in the UI.

Related Issues

Fixes #870

Changes Made

• Flipped boolean in Node store to include "self" which is the node you are currently connected to.
• Added undefined check in Messages to resolve some TypeScript errors.

Testing Done

Opened the webUI and determined the node you are connected to is favouriated and and at the top of the list.

Checklist

• Code follows project style guidelines
• Documentation has been updated or added
• Tests have been added or updated
• All i18n translation labels have been added (read
  CONTRIBUTING_I18N_DEVELOPER_GUIDE.md for more details)

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[Copilot]

Pull Request Overview

This PR restores the user's own node to the UI by making it visible in both the messages screen and node list. Previously, the user's connected node was hidden from these views.

• Changed node filtering to include the user's own node in both messages and nodes pages
• Added undefined check for improved TypeScript safety when accessing the current node
• Updated type signature to reflect that getMyNode may still return undefined in some cases

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/web/src/pages/Nodes/index.tsx	Enable inclusion of user's own node in the nodes list
packages/web/src/pages/Messages.tsx	Include user's own node in messages view and add safety check
packages/web/src/core/stores/nodeDBStore/index.ts	Update getMyNode return type signature

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