feat: put every section heading on the same rung

[TheSevenPens]

Six commits taking one design decision — where a section heading sits in the type ramp — from a single tab to the whole app, then following its consequences.

1 · Advanced → Daemon

Six SectionLabel captions become Display.section, the 22px rung the tablet About tab settled on. Same shape of page: a 40px tab menu with sections beneath it.

Lowercased with the size — the tab menu above already reads daemon in lowercase display type, so an uppercase caption under it was a second, louder voice for a quieter thing. OTD UX follows the tab menu's own json and becomes otd ux.

2 · The rest of the app

The remaining 39 SectionLabel uses were doing three different jobs, so they were split rather than converted wholesale. 31 became headings:

• 8 SectionLabel largetitle. That modifier existed precisely to mark "heading, not caption", so it was the app's own answer. It now has no users and is deleted.
• 10 plain SectionLabels that were headings despite the class — conflicting drivers detected, installed plugins, pen input, and so on.
• Section.Title, which templated to a SectionLabel through an uppercase converter. Retemplating it moved 13 more titles at once and means every future Title= gets this for free. Swapped to the LowerCaseConverter that already existed.

8 were deliberately left alone, because they share the class without sharing the role: the sortable column headers in the supported-tablets and calibration-report dialogs, TABLET / ACTIVE AREA above the mapping comparison, HOVER LIMIT beside its slider, Entity's own row title, and PenSwitchCard's label in a 240px card. SectionLabel keeps its caption job for exactly these.

Display.section gains Margin 0,0,0,6 so call sites no longer each supply one; About and Daemon pass an explicit 0 and are unaffected.

3 · Fallout the resize exposed

Settings → Appearance read "appearance" twice down the left edge once the section matched the tab's voice. The section is now theme & backdrop — theme alone would have collided with the Theme field label directly beneath it, and undersells a section that also holds falling petals and the background controls.

Screenshots got its own Developer tab. It was a column of INTERFACE, folded there when an older Screenshot tab was retired — but INTERFACE is about how the UI is shown (hidden tabs, forced window sizes) and capturing it is a different job. INTERFACE is simpler for it: its right column held a StackPanel purely to stack two sections, and with one left that wrapper goes.

Daemon's property lists lost their bullets and trailing colons. The two-column grid is what separates a label from its value, so both were punctuation standing in for a layout that already works — and the bullet pushed every label off the margin the headings and body text share. These rows now match the tablet About tab's facts exactly.

For the reviewer

• Verified rendering on pen/basics, all five Settings tabs, three Advanced tabs, and tablet/calibration.
• Not seen rendering, all conditional and inactive on this machine: vmulti driver, kuuube's windows ink plugin, Custom look (Custom theme only), the Linux-only desktop-entry title, and Daemon's external daemon / system-installed daemon.
• Docs unaffected: every reference is to the Appearance tab, which keeps its name.
• 673/673.