fix: show correct help text for FLUX Redux image influence control

[aniketkrs]

Summary

The FLUX Redux Image influence slider's (?) help card showed the Canvas Denoising Strength text — "Controls how much the generated image varies from the raster layers." — which is completely unrelated to the control and misled users tuning reference-image influence.

The control (FluxReduxControls) was wired to the existing hints.imageInfluence key, which holds the Canvas Denoising Strength copy. This adds a dedicated hints.fluxReduxImageInfluence entry in en.json with copy describing the actual control (Low/Medium/High/Highest reference-image strength) and points the Field at it. The existing hints.imageInfluence entry is untouched.

Related Issues

Fixes part of #9619 (item 6 in @lstein's comment: "Redux influence needs its own hint text").

QA Instructions

1. Open a FLUX Redux generation (Image to Image with a reference image).
2. Hover the (?) next to the "Image influence" slider.
3. The help card should be titled "Image Influence" with text about the reference image's influence — not "Denoising Strength" / raster layers.

Review

• Before: ReferenceImageControls.tsx:369 had hint="imageInfluence", whose locale entry describes Canvas Denoising Strength.
• After (verified on this branch): the Field uses hint="fluxReduxImageInfluence"; en.json has the new key with the correct copy; the old hints.imageInfluence entry is unchanged.
• en.json was JSON-validated after the edit.

Checklist

• Focused change, two files, one control affected
• Existing hint entry left untouched for any other consumers

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-10-14T04:15:15.409789Z	1d8f258	PR opened

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