Supporting the mult-line text control

[tarleomkar]

@echolove38 @jfhenon @pmkrawczyk @brettz9 @cuixiping @pmkrawczyk i've been implemented that but having sometrouble due to fuxa uses the svg library the behaviour comes into picture like its taking spaces after the text dividationa and only the one vertical horizontal line is there for the entire text box likewise in simple
implemented the multi-line text functionality using elements inside the SVG tag. This is the only reliable method in SVG to handle line breaks.

However, due to SVG’s native rendering behavior, the line spacing can’t be pixel-perfect or tightly controlled like in standard HTML/CSS. You may notice extra spacing or alignment quirks — that’s expected with how dy="1.2em" works in .

Just wanted to highlight that this is the standard approach for multi-line SVG text, and all functionality is working correctly within those SVG limitations.

Originally posted by @tarleomkar in #821

[simonhackler]

I vibe coded multiline text into svgedit: https://github.com/simonhackler/svgedit
There are also some other random changes in my fork.
It uses the wonderful new pretext library: https://github.com/chenglou/pretext

My vibe coded solution is obviously bad, but I think using pretext could be a valid way to get multiline text into svgedit