fix: make ollama model selection work

[c01o]

Thank you for developing such an excellent plugin!

I found ollama model name selection does not work.

The current implementation appears to have two issues:

• Selected models are not saved into data.json.
  • fixed in l712-715
• Selected model names are reset to the default ones when opening or refreshing the settings tab.
  • This happens because dropdown.getValue() returns nothing if there is no corresponding option.

I should mention that I’m not very familiar with this project or, more generally, with Obsidian plugin development. If there are any conventions or best practices that I’ve overlooked, please know it’s unintentional, and I’d appreciate it if you could point them out.

[glowingjade]

Sorry for the bug. Thanks for your contribution!