feat(stringify): inline/block detection and #default slot emission

[larbish]

Inline/block component detection (mdc.ts)

A component is now stringified as inline only when it appears inline in text flow

// Before
:inline[Syntax]

// After 
::inline
Syntax
::

// Text siblings → still inline (unchanged)
inline :component syntax

#default slot emission (template.ts)

The #default slot marker is now omitted when it is the only slot in a component. It is preserved when multiple named slots are present.

// Single slot: #default dropped
::component
Content
::

// Multiple slots: #default kept
::component
#first
First

#default
Second
::

Parent propagation (strong.ts, emphesis.ts)

strong and em now pass themselves as parent when processing children, consistent with p and a. This is required so that MDC components nested inside bold or italic are correctly detected as inline.

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Project	Deployment	Actions	Updated (UTC)
comark	Ready	Preview	Mar 6, 2026 3:03pm

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commit: 00a698c