fix(range): update knob positions when dualKnobs changes

[brandyscarney]

Issue number: resolves #31026

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What is the current behavior?

Opening an ion-range with dualKnobs set to true with a value set inside of a modal does not render the values properly.

What is the new behavior?

• Added a watcher for dualKnobs that calls updateRatio(), ensuring knob ratios are recomputed whenever dualKnobs changes. The min, max, and value properties already had watchers. dualKnobs was the only ratio-affecting property without one.
• Knobs are now positioned correctly regardless of whether value or dualKnobs is assigned first. They are also repositioned correctly when dualKnobs is toggled at runtime in either direction.
• Range now sets the correct values when used inside a modal, including when dualKnobs and value are assigned in different orders.
• Improved the dualKnobs property description.
• Added e2e tests covering both property assignment orders and runtime toggling of dualKnobs.

Does this introduce a breaking change?

• Yes
• No

Other information

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Project	Deployment	Actions	Updated (UTC)
ionic-framework	Ready	Preview	Aug 18, 2026 8:55pm

[thetaPC]

LGTM