Revert T1 interceptor and Swiftwind StartTurnDistance 10 -> 5

[lL1l1]

Issue

After #5042, interceptor micro feels bad due to the unintuitive nature of the huge StartTurnDistance, which is the distance within which aircraft will hover instead of turn to move to a waypoint.

1. it's unintuitive for a winged aircraft to hover
2. most air have a distance of 5, so micro skills do not transfer properly.
3. there is no visual indicator for the distance so move orders meant to micro turns end up hovering inties, especially when large numbers of inties are in formation

Related discord post.

Description of the proposed changes

Revert the StartTurnDistance from 10 to 5 for inties and swiftwinds.

Testing done on the proposed changes

• Inties now usually try to turn when I want them to by giving short nearby move orders.
• Inties still dock at air staging in a reasonable time (with ASF as a baseline), taking 1-2 loops around the air staging to dock.

Checklist

- [ ] Changes are annotated, including comments where useful

• Changes are documented in a changelog snippet according to the guidelines.
• Request 2-3 reviewers from the list of reviewers and their areas of knowledge.

[coderabbitai]

Walkthrough

This pull request adjusts the turn-initiation behavior for five T1 interceptor units (UAA0102, UEA0102, URA0102, XAA0202, XSA0102) by reducing their StartTurnDistance from 10 to 5. A changelog entry documents this balance change in issue #6966.

Changes

Cohort / File(s)	Summary
Changelog entry changelog/snippets/balance.6966.md	Adds changelog documenting that T1 Interceptors and Swiftwinds now initiate hover behavior sooner when given a move order due to StartTurnDistance reduction
Unit balance adjustments units/UAA0102/UAA0102_unit.bp, units/UEA0102/UEA0102_unit.bp, units/URA0102/URA0102_unit.bp, units/XAA0202/XAA0202_unit.bp, units/XSA0102/XSA0102_unit.bp	Reduces Air.StartTurnDistance value from 10 to 5 across all five interceptor unit blueprints

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Verify that all five unit blueprints received the consistent value change
• Confirm changelog entry accurately reflects the modification
• Check that no other properties were inadvertently altered in the blueprints

Possibly related PRs

• Strat agility buff #6535: Adds the StartTurnDistance field to the UnitBlueprint API, providing foundational support for this value adjustment across multiple units.

Suggested labels

area: balance

Suggested reviewers

• Rhaelya

Poem

🚁 Swift interceptors now turn with haste,
Five units quicker, no time to waste,
From ten to five, they hover sooner,
No more delays for each Swiftwind runner!
Balance tuned, the skies now race. ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: reverting StartTurnDistance from 10 to 5 for T1 interceptors and Swiftwinds, which aligns directly with the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The PR description covers all essential sections: issue context, proposed changes, and testing done. Changelog snippet is documented and checklist partially completed.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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