T02 typography: text styles, keys, formatters, fit, links, math, motion text

Headings to overlines, Code, Kbd and KbdCombo on gpui keystrokes,
Highlight, MiddleEllipsis and EllipsisTooltip, links, eight formatted
values on jiff with a typographic minus, CopyableText, SelectableText,
Emoji, a TeX subset, rolling AnimatedNumber, Typewriter, tonal
GradientText, ShimmerText. Gallery probes now hug their targets.
Codex gpt-6-astra (max): PASS in round 2.

src/typography/mod.rs

@@ -0,0 +1,29 @@
+mod copy;
+mod effects;
+mod emoji;
+mod fit;
+pub mod format;
+mod formatted;
+mod inline;
+pub mod keys;
+mod link;
+mod math;
+mod rolling;
+mod select;
+mod text;
+
+pub use copy::CopyableText;
+pub use effects::{GradientText, ShimmerText, Typewriter};
+pub use emoji::Emoji;
+pub use fit::{EllipsisTooltip, MiddleEllipsis};
+pub use format::DurationStyle;
+pub use formatted::{
+    CurrencyText, DateTimeText, DurationText, FileSizeText, NumberText, PercentText, PluralText,
+    RelativeTime,
+};
+pub use inline::{Blockquote, Code, Highlight, Kbd, KbdCombo};
+pub use link::{ExternalLink, Link};
+pub use math::{Latex, MathError};
+pub use rolling::AnimatedNumber;
+pub use select::SelectableText;
+pub use text::{Caption, Heading, Label, Overline, Paragraph, Subtitle, Title, tabular};