Solid already consumes named slots as props ({props.prefix}, or {props.prefix?.(args)}
when scoped), but the ComponentInstance codegen emitted the fill as a dead <Tag.name>
child, so slot content never reached the consumer. Emit the fill as the matching prop —
a node prop when unscoped, a function prop when it takes args.

Qwik emitted named-slot fills as dead <Tag.name> children while consuming named
slots via <Slot name>, but never tagged the fill with q:slot — so projected
content silently vanished. Rather than add q:slot wrappers, align Qwik with
React/Solid: named slots are props (a node prop, or a function prop when scoped),
consumed as {props.prefix}. Verified Qwik renders the JSX-valued prop inline with
no extra wrapper element. The default slot still projects through native <Slot/>
(Qwik never populates props.children); emitsQwikSlot updated so the Slot import is
dropped when only named slots are used.

A dynamic native attribute was emitted as an Angular property binding
([id]="id()"); when the signal returns undefined, the assignment reflects as the
literal id="undefined" (and ?? null can't help — a property binding stringifies
null to "null"). Emit non-property attributes as attribute bindings
([attr.id]="(id()) ?? null"), which Angular removes when the value is null.
Boolean/value-semantic and special bindings (value, disabled, readonly, style, …)
stay property bindings via a KEEP_PROPERTY set, since [attr.disabled]="false"
would wrongly render disabled="false". Component @input bindings are unchanged.

…Qwik)

A re-projected named-slot fill — `icon={<Slot name="icon"/>}` — has a SlotPlaceholder
body, which Solid's inlineNode and Qwik's emitNodeInline rendered as the JSX-braced
`{props.icon}`. Inside the attr-value fill (`icon={…}`) that double-wrapped to
`icon={{props.icon}}`, a parse error caught by the lint conformance suite. Solid's
inlineNode now returns the bare slot read (matching React); Qwik gains a namedSlotRead
helper used by both the SlotPlaceholder emit (braced) and the fill (bare).

…egen fixes

The compiler changes (React node-prop slots + readonly→readOnly, Angular nullish
[attr.*] bindings) alter the generated Input and Button output. Regenerate the
affected component snapshots and update the styled-Input assertions to the new
node-prop / attribute-binding forms.

…gets

Add unit tests for the named-slot codegen branches introduced/touched by this
work — re-projected slot fills (scoped/unscoped, named/default, with/without
fallback) across React/Solid/Qwik, plus expr-rewrite expression forms and
Angular control-flow/binding branches. Brings the changed files to >90%
statement/line/function coverage (and >90% branch on React/Solid/Qwik/expr-rewrite).