Feat: Configurable Attack Ratio Increment

[Codimow]

Closes #2822

Description:

This PR adds a new setting to allow users to configure the increment step for the Attack Ratio keybinds (and scroll wheel). This addresses the need for more fine-grained control over troop deployment, especially in late-game scenarios where 10% increments can be too large.

Please complete the following:

• I have added screenshots for all UI updates
• I process any text displayed to the user through translateText() and I've added it to the en.json file
• I have added relevant tests to the test directory
• I confirm I have thoroughly tested these changes and take full responsibility for any bugs introduced

Please put your Discord username so you can be contacted if a bug or regression is found:

codimo

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[Aotumuri]

#2835
It overlaps with this.

[Codimow]

@Aotumuri, oh didn't spot that, but i think my implementation is better though both accomplish the core function

[ryanbarlow97]

I think my UI refinement PR will probably get approved first, which moves the keybinds modal into the options modal, so this may have a few issues, if you want to make a PR to merge this into "ui" branch i can approve it

[Codimow]

@ryanbarlow97 sure

[iiamlewis]

As Ryan's comments this is now out of date, please re address and open a new PR