feat(reading): larger default text, a Text Size setting and fixed tab labels

[kazo0]

Closes #70, closes #71. #69 stays open for its favorites half.

Why

Since the Uno port (4.0.x) the reading is set in Material's BodyMedium (14) with a HeadlineSmall title (24). The Xamarin app used iOS Body 17 / Title 28, so the body text got 18% smaller, and on iPad the #27 column cap turned it into a small block at the top of an empty screen. Every store review and issue since (#69, #70, #71) is about the small print. Reproduced in the iOS 27 simulator; the Text Size setting in iOS does reach the app (Uno's Skia host scales it), but only after a relaunch, and at the accessibility sizes the tab labels ran into each other ("ReflecticSober TiSettings").

The other tabs shrank the same way (compared against the 2020 Xamarin screenshots in images/ios): Sober Time's count and date 28 → 24, its tagline 22 italic → 14; the Settings rows 17 → 14 with 12 details. The nav bar title (17 → 22) and tab labels (10 → 12) grew and stay as they are.

What changes (spec 013)

1. Reading sizes are the Xamarin app's again. DailyReflectionPage binds each FontSize to the model's TextScale through a ScaleConverter with the base as parameter: title 28, quote and thought 17, source line and copyright 13. The Material styles only supply family and weight now.
2. New Settings → Readings → Text Size picker: Normal, Large, Extra Large, Huge (×1 / 1.2 / 1.4 / 1.65). Stored as ReadingTextSize (Normal = 0, so existing installs are unchanged) and sent as an EntityMessage<ReadingTextSizeSelection>, same shape as the secular toggle. The device text size still applies on top.
3. The 720px column scales with the text, so the line length stays the same at every size.
4. Tab labels no longer scale with the OS text size, like native iOS tab bars: each is an explicit TextBlock with IsTextScaleFactorEnabled="False". Not a ContentTemplate — Uno's ContentPresenter also binds it for the Icon presenter, which then showed the template instead of the icon (reproduced; see the comment in MainPage.xaml).
5. Sober Time is back to 28 for the date and count and 22 italic for the tagline, and follows the Text Size setting: SobrietyTimeModel projects its own TextScale and the page binds the icon, date, count blocks and tagline through the same converter. ScaleConverter now treats a non-positive scale as unbound, because the generated view model exposes the feed as 0 before its first value and these TextBlocks (no FeedView) render before that.
6. Settings rows are 17 with 15 for the value / description line through a page-scoped override of the Material BodyMediumFontSize / BodySmallFontSize tokens in SettingsPage.xaml (Uno Themes lightweight styling), which the SettingsRows.xaml templates pick up too. Page-scoped on purpose: app-wide it would resize the tab labels. Section headers stay 22; nothing is smaller than in 4.0.39.
7. Uno.Fonts 2.10.0-dev.12 (ahead of the Sdk's 2.10.0-dev.9): the first Roboto with italic faces, so FontStyle="Italic" renders again on the Skia heads (the quote, the Sober Time tagline, the book title). Uno.Material only brings Roboto transitively, so the csproj references it directly and Directory.Packages.props pins it through UnoFontsVersion. Drop both once the Sdk catches up.
8. The settings dropdowns are an elevated, outlined menu surface. The Material ComboBox popup is a flat Surface, the same brush as the filled cards, with no border or shadow, so an open menu merged with the rows under it (pre-existing on Sober Time Display; the new Text Size picker made it obvious). DRSettingsComboBoxStyle now wraps the list in an ElevatedView (the Toolkit card's elevation 6 / radius 12, translucent shadow) with the 1px OnSurfaceLow outline the picker presenters use, which carries the edge in dark theme.
9. release_notes.txt rewritten for the next release (prepare-release refuses an unchanged file).

Verified

• iOS 27 simulator, iPhone 16 Pro: Normal renders at 17/28 (matches the old app); forcing Huge through the preference store scales the whole reading and the column; at the largest accessibility text size the tab labels stay fixed and apart, icons intact, selected state intact.
• Local WebAssembly build driven headlessly with Playwright at phone width: Sober Time shows the date and "5 Years / 3 Months / 28 Days" at 28 and the tagline at 22; with Huge stored, Sober Time and the Reflection tab rescale while the Settings rows (17/15) and the tab labels do not. Desktop width: the Settings rows are 17/15 and the side rail's labels are unchanged.
• Web preview (pr-73, driven headlessly with Playwright): Settings shows "Text Size / Normal"; the picker lists Normal, Large, Extra Large, Huge; picking Huge updates the row and the Reflection tab rescales with a wider column — the full settings → reflection path through the real UI.
• iPad Pro 11" simulator, Normal: the reading is 17pt in the column (was 14pt).
• Installed and launched on a physical iPhone 14 (signed with the team profile).
• iOS 27 simulator after the fonts bump: the quote and the book title render italic (they were upright before).
• Settings dropdowns (web head, Playwright): Text Size and Sober Time Display open as a shadowed, outlined menu at phone width in light theme and at desktop width in dark theme.
• 52 presentation + 58 services tests green; ViewSurfaceTests pins the six scaled reading FontSizes, the scaled MaxWidth, the eleven scaled Sober Time bindings, the two Settings token overrides (and their absence from App.xaml), the picker binding and the six fixed labels.

Notes for the merge

• Which release? These users are on 4.0.39. Merging to master ships it with the v4.1 cut; backporting to release/v4.0 (after feat(stores): App Store and Play listing text (backport #63, #65, #67 → release/v4.0) #72) would ship it as 4.0.4x. Your call — note that this PR's release_notes.txt replaces the 4.0 "rebuilt" text, so a backport would carry the new notes too.
• The FontSize bindings through ScaleConverter on styled TextBlocks are a stopgap: the sizes belong in the Material type-scale tokens (lightweight styling), but nothing re-resolves those after a runtime write. Kept as is pending DefaultFontScale: runtime-settable root token for the type scale, exposed through SemanticThemeHelper unoplatform/Uno.Themes#1758 (a runtime-settable DefaultFontScale through SemanticThemeHelper); when that ships, the bindings become page-scoped token overrides.
• The Text Size picker sits under the Readings header but now drives Sober Time as well. Renaming or moving it is a product call; not done here.
• The Sober Time tagline is an unstyled TextBlock, so it takes the Material body typeface (medium weight) and reads heavier than the HeadlineSmall count above it; the old one was regular italic. Pre-existing; one FontWeight attribute if you want it regular. (The upright italic is fixed by the fonts bump above.)
• The known desktop compositor issue (stale rendering after a tab switch, AGENTS.md) reproduces with this setting as with the secular toggle: change the size, return to Reflection, overlap until the window resizes. Not new.
• On iOS a Text Size change in the system Settings only applies after the app is relaunched (framework behaviour on the Skia host). Not addressed here.

🤖 Generated with Claude Code

https://claude.ai/code/session_01DxndQ1L7ruaSHzi9voExNb

[github-actions]

🌐 Web preview deployed

https://pr-73.dailyreflection.pages.dev

Built from 2f40d96. Updates on every push.

[kazo0]

/steve-ops backport release/v4.0

[steve-ops-bot]

✅ Backport to release/v4.0 opened as #76.