Bug Report: viz:color attribute is ignored when providing rgba values

**Info**
- Gephi Lite version : 1.0.2
- Operating system: macos Tahoe 26.3
- Web browser: 147.0.4 (aarch64)

**Steps to reproduce**
1. create a network graph with the viz:color attribute
2. export the graph via write_gexf() in python
3. import in gephi

**Expected behavior:**
Nodes should be colored as specified in the viz:color attribute. This works in the Gephi desktop version.

**Actual behavior**
All nodes are grey. viz:color attribute is ignored.

**Workaround:**
I noticed that when exporting from gephi lite to gexf, the viz:color attribute only has r, g, b values and not r, g, b, a.

gephi lite exports:
``````

networkx exports:
``````

After deleting the alpha channel for each viz:color attribute, gephi lite correctly displays the color.

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