feat: optimize Oscilloscope layout

[AsCress]

Fixes #2907

Summary by Sourcery

Enhancements:

• Adjust OscilloscopeScreen flex values to expand the waveform display area and reduce the tab panel width

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR fine-tunes the Oscilloscope screen layout by adjusting the flex ratios of the main content area and the tab panel to improve spacing and visual balance.

File-Level Changes

Change	Details	Files
Adjusted flex distribution between main content and tab section	Increased main content flex from 87 to 89 Decreased tab section flex from 13 to 11	lib/view/oscilloscope_screen.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#2907	Optimize the Oscilloscope screen layout to better utilize space, including adjusting the width of the measurement screen view and the right menu choices.	✅
#2907	Revert or adjust specific UI elements (dashed line style, top red bar height and font size, measurement area font size and spacing, bottom area height and font size, stop/pause icon, CH1/CH2 options, (i) symbol for Automated Measurements, Logged Data option, and measurement screen width) to match the previous app version.	❌	The diff only changes the flex values for the main measurement area and the right menu, affecting their relative widths. It does not address other UI elements such as dashed line style, top red bar, font sizes, stop/pause icon, CH1/CH2 options, (i) symbol, or Logged Data option.

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[github-actions]

Build Status

Build successful. APKs to test: https://github.com/fossasia/pslab-app/actions/runs/17981380855/artifacts/4095199333.

Screenshots

Android Screenshots

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iPad Screenshots

[mariobehling]

Thanks, please provide screenshots when you finalize this PR.

[AsCress]

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