fix(dialog): anchor option indicators to dialog text

[postyizhan]

Summary

Fixes dialog option indicators being rendered too far to the left and hidden behind NPC models.

Changes

• Anchor the classic dialog > indicator to the visible start of the selected option text.
• Account for leading whitespace and formatting codes when calculating the indicator position.
• Keep option text, option images, and interaction hitboxes unchanged.
• Apply the same text-relative positioning to the modern dialog GUI.
• Preserve existing quest ! markers and radial dialog indicators.

Now

Testing

• ./gradlew compileJava --no-daemon
• Manually verified the classic dialog GUI with an NPC model and multiple options.