🔍 Lens: Fix typographic scale inversion in Settings & ContentView

[iamkeeler]

The Problem:
In FormattingCustomizationView, the page's main title "Rich Text Formatting" used .title3, but the specific element header (e.g. "Body Text") used .title2. This inverted the typographical hierarchy, creating cognitive friction by making the sub-section visually more dominant than the page title. In ContentView, the "Markdown" label used .subheadline, which was too small to establish a clear section hierarchy over the input field.

The Visual Logic:
Typographic Scale dictates that headings must be larger than body text and descend logically (Page > Section > Component). By promoting the Page Title to .title2 and demoting the section header to .title3, we map the visual hierarchy to the logical hierarchy. Promoting the input label to .headline establishes it as a section leader without overpowering the CTA.

The Surgery:
Modified existing .font() view modifiers in FormattingCustomizationView.swift and ContentView.swift. No new components or custom font sizes were created; relied entirely on Apple's standard dynamic type scale values (.headline, .title2, .title3).

A11y/IA Impact:
Standardizing to the correct Apple dynamic type scale improves the predictability of the mental model, ensuring users immediately recognize their current context within the hierarchy, while fully supporting dynamic type scaling.

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PR created automatically by Jules for task 6456523338276352721 started by @iamkeeler

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