Added text files reader

[veronika-tseleva-cleantalk]

https://app.doboard.com/1/task/50634

[Copilot]

Pull request overview

This PR adds support for opening “text-like” attachments (code/config/log files) in a lightbox, using Ace Editor for syntax highlighting, and includes a small date-formatting guard to avoid errors on missing timestamps.

Changes:

• Classify attachments as image vs text to decide whether to open in an image lightbox, text lightbox, or download.
• Add a text lightbox implementation that fetches the file content and renders it in Ace Editor.
• Guard date formatting against falsy inputs (but currently returns undefined, see comments).

Reviewed changes

Copilot reviewed 3 out of 6 changed files in this pull request and generated 3 comments.

File	Description
styles/doboard-widget.css	Adds new lightbox styles intended for text viewer (currently overrides existing image lightbox styles).
js/src/widget.js	Adds text-file detection + Ace-based text lightbox and routes clicks accordingly.
js/src/handlers.js	Updates formatToDotMonthDate to handle missing input (needs a safe default return).
dist/doboard-widget-bundle.js	Rebuilt bundle reflecting the above source/style changes.

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