feat: add per-entity logarithmic override

[mxr]

Adds per-entity logarithmic configuration so mixed-scale graphs work correctly.

Specifying 'secondary' for the y-axis isn't enough for my use-case. I have a graph with two waveforms: one waveform is brightness on the primary y-axis (roughly 1 to 5000), while another waveform is sunrise/sunset on the secondary y-axis (boolean 0/1). With only global logarithmic: true, the sunrise/sunset waveform breaks; this change allows keeping brightness logarithmic while leaving sunrise/sunset linear via entity-level override.

Resolves #862

Current	Example of why logarithmic: true globally doesn't work	Example with the fix

[ildar170975]

Thank you! Will check it soon.
Meanwhile, if you have some spare time, test other PRs; start with recently updated ones. Of course, only if you are interested in the proposed functionality, no obligations))

[ildar170975]

@mxr
Added some observations, please consider.

For me, the whole "graph" functionality (described in a graph.js) is still a complex thing which I am not 100% familiar with.
In this PR there are mostly SIMPLE changes, a global logarithmic option is "augmented" by a a per-entity option.
What probably needs to be at least confirmed - is a building a logarithmic graph itself.
Of course, we may blindly trust the current implementation - but these algorithms should be analysed & improved if needed in future (at least to become "maintainable").

For now, I think this PR achieved it's minimal goal (per-entity option).
@akloeckner - please review when you have a spare time.

[mxr]

Thanks for the feedback. I implemented it in mxr@6518e8b (GitHub seems to be lagging so I amended the prior commit)

What probably needs to be at least confirmed - is a building a logarithmic graph itself.

I have an example in the PR description. Let me know if I misunderstood.

[ildar170975]

I totally understood your example, I meant a technical implementation of the Graph class itself. Repeat, the PR looks fine, but since personally me may not know some details of Graph class, I am not sure that the whole logarithmic thing works properly. Let’s merge and then test.

[ildar170975]

ping @akloeckner

[ildar170975]

@mxr
I approved these changes on March, just did not push the "approve" button )))
We have a bunch of unmerged PRs now, let's wait for @akloeckner (we do things in a team here) & make a RELEASE.
Thanks again for the contribution, sorry for the delay.
As you probably know, you can start using js with your changes right now (download it from here - https://github.com/kalkih/mini-graph-card/actions/runs/22955326308/job/66630389391)

[ildar170975]

@mxr
Based on personal experience, I think we need to add some clarifications to Docs about "what a logarithmic thing is".
(BTW, for stock History graph & Statistics graph cards there were even plans to exclude a corresponding "logarithmic scale" option from UI editor & make it available for yaml only - many people checked this option & did not understand what they got).
At least, we need to add a note about "for any values < 1 - the logarithmic graph will be 0" - this is a current implementation, i.e. here yellow values fall back to 0:

[mxr]

@ildar170975 thanks added some docs

[ildar170975]

@ildar170975 thanks added some docs

Thanks, I think these clarifications are good, they seem to be clear even for non-technical people.