Add icons to workspaces

[vraravam]

Pre-flight Checklist

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Description of Change

The final intent of this PR is to show the collapsed/expanded sidebar of workspaces with only the icons / favicons as set by the user. If no icon was chosen, then the first character of the workspace name can be used as the default. The intended behavior is similar to the MS Edge browser where the tab bar is vertical position

This is the initial cut to show the first character of the workspace name in a styled box (to the left of the name).
The next items (TODO) still to do as part of this PR will be:

1. Control showing of this icon via a user preference
2. Add a grab handle that extends vertically, which when clicked will show/hide the workspace name span element
3. Store the expanded/collapsed state of the workspace drawer in the preferences store and use it when restarting Ferdium
4. Styling of the icon
   Currently, this does not handle actual icon files, instead uses the first character of the workspace name. This could be enhanced in the future to support images that the user could upload and can be rendered similar to service icons.

Motivation and Context

#139 (comment)

Screenshots

Checklist

• My pull request is properly named
• The changes respect the code style of the project (pnpm prepare-code)
• pnpm test passes
• I tested/previewed my changes locally

Release Notes

[mcmxcdev]

Hey @vraravam, are you planning to finish this PR at some point or should we close it?

[vraravam]

Closing since I am not working on Ferdium atm.