Fix missing saturatedPressure unit conversion in SSMT boiler

[Copilot]

Checklist

• Variable, function, and class names are descriptive
• Code leverages existing architecture, helper methods, and shared modules when applicable
• Development artifacts such as console logs, test values, and comments have been removed
• All Copilot, Claude Code, or other LLM implementations have been reviewed as if contributed by another developer
• UI changes have been manually tested for usability and appearance
• This PR references the related issue number (if applicable), ex. issue -> #0000

Description

When a user changes pressure units in SSMT Assessment Settings and accepts the "update data" prompt, the Steam Pressure (saturatedPressure) field on the Boiler tab was not being converted — it retained its value in the old unit. Only deaeratorPressure was handled in the conversion block; saturatedPressure (added as part of the Saturated/Superheated steam update) was omitted.

• convert-ssmt.service.ts → convertBoiler(): Added saturatedPressure to the pressure unit conversion block alongside deaeratorPressure.

if (oldSettings.steamPressureMeasurement != newSettings.steamPressureMeasurement) {
  boilerInput.saturatedPressure = this.convertValue(boilerInput.saturatedPressure, oldSettings.steamPressureMeasurement, newSettings.steamPressureMeasurement);
  boilerInput.deaeratorPressure = this.convertValue(boilerInput.deaeratorPressure, oldSettings.steamPressureMeasurement, newSettings.steamPressureMeasurement);
}

Applies to both Saturated (measured by pressure) and Superheated steam configurations.

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