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.

tasks/ch01-10.md

@@ -32,39 +32,39 @@
 
 ## T02 Typography — `src/typography`
 
-- [ ] Heading (H1–H6)
-- [ ] Title / Subtitle
-- [ ] Paragraph
-- [ ] Label
-- [ ] Caption
-- [ ] Overline
-- [ ] Code
-- [ ] Kbd — ⌘ / Ctrl by platform
-- [ ] KbdCombo
-- [ ] Blockquote
-- [ ] Highlight / Mark
-- [ ] Truncate — native `.truncate()`
-- [ ] LineClamp — native `.line_clamp(n)`
-- [ ] MiddleEllipsis
-- [ ] EllipsisTooltip
-- [ ] Link
-- [ ] ExternalLink
-- [ ] RelativeTime
-- [ ] DateTimeText
-- [ ] NumberText
-- [ ] CurrencyText
-- [ ] PercentText
-- [ ] FileSizeText
-- [ ] DurationText
-- [ ] PluralText
-- [ ] CopyableText
-- [ ] SelectableText — prove: selection over `StyledText` layout
-- [ ] Emoji — shortcodes
-- [ ] Latex / MathInline — prove: TeX subset
-- [ ] AnimatedNumber
-- [ ] Typewriter
-- [ ] GradientText — per-glyph tonal ramp
-- [ ] ShimmerText
+- [x] Heading (H1–H6)
+- [x] Title / Subtitle
+- [x] Paragraph
+- [x] Label
+- [x] Caption
+- [x] Overline
+- [x] Code
+- [x] Kbd — ⌘ / Ctrl by platform
+- [x] KbdCombo
+- [x] Blockquote
+- [x] Highlight / Mark
+- [x] Truncate — native `.truncate()`
+- [x] LineClamp — native `.line_clamp(n)`
+- [x] MiddleEllipsis
+- [x] EllipsisTooltip
+- [x] Link
+- [x] ExternalLink
+- [x] RelativeTime
+- [x] DateTimeText
+- [x] NumberText
+- [x] CurrencyText
+- [x] PercentText
+- [x] FileSizeText
+- [x] DurationText
+- [x] PluralText
+- [x] CopyableText
+- [x] SelectableText — prove: selection over `StyledText` layout
+- [x] Emoji — shortcodes
+- [x] Latex / MathInline — prove: TeX subset
+- [x] AnimatedNumber
+- [x] Typewriter
+- [x] GradientText — per-glyph tonal ramp
+- [x] ShimmerText
 
 ## T03 Layout — `src/layout`