fix(messaging): reduce composer recomposition and typing jank

[jeremiah-k]

Overview

This reduces message-composer recomposition and per-keystroke work, particularly on active meshes where node telemetry changes frequently and inline Markdown is enabled.

The composer previously received full Node objects, so telemetry-only node updates could invalidate the input subtree even when no mention-visible identity data had changed. The live editor also performed more text processing and state persistence than necessary during rapid typing.

This keeps the existing Markdown wire format and user-visible behavior while narrowing the composer’s reactive inputs and making the typing path bounded.

Changes

• Replaced full Node composer inputs with lightweight mention candidates containing only ID, long name, and short name.
• Kept telemetry, position, metrics, status, and other unrelated node changes from invalidating the message input subtree.
• Cached normalized mention fields once per candidate instead of lowercasing every field on every keystroke.
• Made mention matching lazy and stopped scanning once the bounded suggestion limit was reached.
• Removed the obsolete duplicate full-Node and candidate matching implementations.
• Added a plain-text fast path that skips Markdown processing when no supported inline delimiter is present.
• Replaced the full GFM parser in the live text-field styling path with lightweight inline-only pattern detection.
• Preserved the established full Markdown renderer for sent message bubbles.
• Preserved raw Markdown delimiters in stored and transmitted message text.
• Kept mention transformation and inline Markdown styling composable in the same display-only output path.
• Debounced draft persistence to SavedStateHandle by 300 ms during rapid typing.
• Kept send and explicit clear operations immediate, cancelling any pending delayed persistence.
• Removed the ineffective onCleared() draft write.
• Kept newly exposed matching and parser helpers internal.

Validation

Added focused coverage for:

• mention matching across ID, long name, and short name;
• case-insensitive matching;
• deterministic ordering and bounded early termination;
• plain-text and incomplete-Markdown fast paths;
• bold, italic, strikethrough, and inline-code live styling;
• bold delimiters not being double-counted as italic;
• exact 300 ms draft persistence behavior;
• rapid edits collapsing into one stored draft;
• explicit draft clearing cancelling pending persistence and clearing immediately.

Existing messaging tests continue to cover raw Markdown transmission, mention completion, formatting behavior, send handling, and draft restoration.

Scope

This change is limited to the message-composer hot path. It does not change transport, database, node-identity, or application-lifecycle behavior.

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