fix(components): reach every typographic component with the cascade

[LeadcodeDev]

Severity Medium, category correctness. Location: crates/rustmotion-components/src/lib.rs:727

Impact

The first pass at making cascade::inherit_from reach painters special-cased Component::Text inside LegacyPaintDispatcher::dispatch. That left the other seventeen components that read color/font-* off their own un-cascaded self.style still blind to inherited typography — gradient_text, caption, rich_text, badge, callout, counter, divider, icon, kbd, list, marquee, notification, number_wheel, pill_nav, table, terminal, tooltip. Worse than the missing coverage, a per-variant match arm means the cascade applies to exactly the variants someone remembered to list: the next component added would silently miss it. That is the same defect class the audit reported elsewhere in this crate, reintroduced by the fix for it.

Fix

Replace the special case with Component::with_cascaded_style, an exhaustive match over all sixty variants with no wildcard arm, so adding a variant without classifying it is a compile error. dispatch and component_intrinsic call it uniformly with no per-variant knowledge. The clone goes through a serde round-trip rather than Clone, because Caption's inner types are not Clone and live in another crate. A membership test pins the classification so an existing variant cannot be silently reclassified either.

Evidence the audit read

let is_typographic = match self {
    Component::Text(_)
    | Component::GradientText(_)
    | Component::Caption(_)
    ...
    | Component::Tooltip(_) => true,

Stacked on fix/table-column-widths, which carries the previous finding of this workstream. GitHub shows only this finding's diff; merge in order.

Part of the September 2026 audit remediation chantier. Refs #220 (RM-07B).