fix: multimeter knob UI

[AsCress]

Fixes the multimeter knob UI which was still rendered incorrectly on some screen sizes.

Screenshots / Recordings:

Summary by Sourcery

Standardize multimeter knob UI dimensions and pointer styling to ensure consistent rendering across screen sizes

Bug Fixes:

• Use fixed responsive radius (105.r) for inner dial and fill painters instead of dynamic size-based calculation
• Change pointer stroke cap to butt and adjust outer and inner pointer line multipliers for correct positioning
• Standardize knob widget dimensions to 300.w by 300.h for consistent layout

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Replaces dynamic size-based dial drawing and conditional widget sizing with fixed responsive dimensions to ensure consistent knob rendering across screen sizes.

Class diagram for updated multimeter knob widget rendering

classDiagram
  class InnerDialPainter {
    +paint(Canvas, Size)
    -radius: double (changed to 105.r)
  }
  class InnerDialFillPainter {
    +paint(Canvas, Size)
    -radius: double (changed to 105.r)
  }
  class InnerPointerPainter {
    +paint(Canvas, Size)
    -radius: double (changed to 105.r)
    -pointerPaint.strokeCap: StrokeCap (changed to butt)
    -pointerStartInner: Offset (radius changed to 1.0)
    -pointerEndInner: Offset (radius changed to 0.77)
  }
  class _MultimeterKnobState {
    -SizedBox.width: double (changed to 300.w)
    -SizedBox.height: double (changed to 300.h)
  }
  MultimeterKnob <|-- _MultimeterKnobState

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File-Level Changes

Change	Details	Files
Standardize dial radius with fixed responsive value	Replaced min(size.width/2, size.height/2) * factor calculations Introduced a constant 105.r radius in all CustomPainters	lib/view/widgets/multimeter_knob.dart
Refine pointer styling and geometry	Switched pointerPaint.strokeCap from square to butt Adjusted outer pointer multiplier from 1.1 to 1.0 and inner from 0.9 to 0.77	lib/view/widgets/multimeter_knob.dart
Simplify knob widget sizing	Removed constraints-based width/height conditionals Set fixed width and height to 300.w and 300.h	lib/view/widgets/multimeter_knob.dart

Possibly linked issues

• #0: PR fixes multimeter knob UI by adjusting dimensions and rendering, resolving the incomplete layout issue.

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[sourcery-ai]

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[github-actions]

Build successful. APKs to test: https://github.com/fossasia/pslab-app/actions/runs/17118554174/artifacts/3815921472