Make the block editor surface the dropcap toggle by deriving it from the resolved reading register rather than a per-rune list. Per SPEC-108 §3 (editor consequence) + Work breakdown 4.
24abc73ad0a14217d2678RuneConfig for editHints, giving runeDefault; additionally expose the active layout's content-slot reading for regionDefault); (b) the READING_CAPABILITIES table (WORK-476) for the prose → dropcap mapping.resolveReading() + READING_CAPABILITIES and shows the dropcap toggle iff the body resolves to reading="prose" — no per-rune list.reading="prose" makes the toggle appear; back to ui/fine removes it. Note this is a distinct affordance class from editHints (which maps data-name sections to edit modes, not boolean toggles).dropcap toggle by deriving it from the resolved register (rune defaultReading + layout/region default + author override), not a per-rune list: the toggle appears iff the body resolves to reading="prose" and reacts to changing the register.prose → dropcap capability mapping are exposed to the editor rather than hardcoded; the editor reuses resolveReading() + READING_CAPABILITIES.editHints.packages/editor/app/src/lib/components/BlockCard.svelte (current editHints read).Completed: 2026-06-26
Branch: claude/spec-108-editor-dropcap
packages/editor/src/server.ts): added makeRuneConfigResolver() — resolves each rune's RuneConfig from the assembled theme config the way the identity transform does (PascalCase typeName for core runes, else separator-insensitive kebab name/aliases for plugin runes, e.g. pullquote→PullQuote). handleGetRunes now attaches the rune's defaultReading to the /api/runes payload (catalog + community runes).packages/editor/app/src/lib/api/client.ts): RuneInfo carries optional defaultReading.RuneAttributes.svelte): imports resolveReading + READING_CAPABILITIES from @refrakt-md/transform; computes the block's resolved register reactively (resolveReading({ authorAttr: attributes.reading, runeDefault: runeInfo.defaultReading })) and filters out register-gated capability attributes unless the resolved register unlocks them. dropcap therefore shows iff the body resolves to prose and appears/disappears as the author flips reading=. The gated-attr set is derived from READING_CAPABILITIES keys, so new capabilities gate for free — no per-rune list, no hardcoded prose→dropcap rule. Mirrors the existing isSplitOnly context-gating pattern.packages/editor/test/rune-config-resolver.test.ts): covers the name↔config join (typeName, separator-insensitive name, plugin-by-name, fine/unset, unknown). 27 editor tests green; server tsc + app vite build clean.regionDefault is intentionally omitted from the editor's resolveReading call: per the shared contract a region default seeds only the bare body, never a rune, so it cannot change a rune block's resolved register (the editor edits rune blocks). The bare article body reaches dropcap by wrapping its opening passage in textblock (a rune, defaultReading: prose) under the identical rule — so no layout/route lookup is needed, and the result is engine-faithful. A region-level "drop-cap the first paragraph" flag is explicitly out of scope per SPEC-108 §3.resolveReading/READING_CAPABILITIES (already unit-tested in transform/reading.test.ts), so the editor never duplicates engine logic. A manual editor pass is still worthwhile to confirm the visual affordance, but the join + resolution are unit-guarded.