Support hyperlinks on text nodes: make the whole text clickable to a defined URL

[patriciafmed]

Description

Users need to be able to link a text element in the moodboard canvas to an external URL. The entire text of the node acts as the hyperlink.

Expected behavior

• The user selects a text node and can set a URL for it.
• Once a URL is set, the whole text is rendered as a link: blue color + underline (applied to the full text of the node).
• The text is clickable and opens the URL in a new tab.
• The user can edit or remove the URL from the node. When the URL is removed, the text goes back to its previous style (no blue, no underline).

Current behavior

Text nodes are plain text only. There is no way to associate a URL, so users paste raw URLs as text and copy them manually.

Out of scope

• Rich text / per-fragment formatting inside the text node.
• Linking only a fragment of the text: the hyperlink always applies to the full text of the node.