Cleaner conceptual model: the parsed state object is the place where
all derived facts about the content live, so `isMarkdown` becomes a
field on `RichTextViewerState` (populated by `RichTextParser.parseText`
using the same cheap heuristic).
`RichTextViewer` now calls `CachedRichTextParser.parseText` once at the
top and dispatches on `state.isMarkdown` instead of running a separate
scan. `CachedRichTextParser.isMarkdown(content)` and its dedicated
`isMarkdownCache` go away — the single `richTextCache` carries the
decision alongside the parsed segments.
Inner callers (`DisplaySecretEmoji`, `MultiSetCompose` reaction
preview, `DisplayUncitedHashtags`) are unaffected: they continue to
receive a fully-parsed state with all segments populated.
Claude
7e2e3304e1