Keybind Ground Attack (#1258)

## Description:

- Implement ground attack logic in ClientGameRunner
- Move cursor location logic from doBoatAttackUnderCursor to
getTileUnderCursor for reusability.
- New keybind G for Ground Attack
- Add translations for ground attack labels in English

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory*
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [X] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

<img width="902" alt="image"
src="https://github.com/user-attachments/assets/54bb3178-af2e-4715-bfa2-82b7fe0e8e85"
/>

*The getTileUnderCursor() and doGroundAttackUnderCursor() methods are
private with many dependencies. I did not do isolated unit testing and
thus zero tests where added.

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

eng.la

---------

Co-authored-by: evanpelle <evanpelle@gmail.com>

src/client/UserSettingModal.ts

@@ -416,6 +416,15 @@ export class UserSettingModal extends LitElement {
         @change=${this.handleKeybindChange}
       ></setting-keybind>
 
+      <setting-keybind
+        action="groundAttack"
+        label=${translateText("user_setting.ground_attack")}
+        description=${translateText("user_setting.ground_attack_desc")}
+        defaultKey="KeyG"
+        .value=${this.keybinds["groundAttack"] ?? ""}
+        @change=${this.handleKeybindChange}
+      ></setting-keybind>
+
       <div class="text-center text-white text-base font-semibold mt-5 mb-2">
         ${translateText("user_setting.zoom_controls")}
       </div>