…ation, directives, bind shorthand, snippet params

Removing the source-script over-suppression (previous commit) exposed several
Svelte template constructs whose references the extractor never collected, each
becoming a false positive on noUnusedImports/noUnusedVariables:

- `{expr}` inside quoted attribute values (`style="top: {top}px"`): the parser
  stores these as one opaque string token, so a brace/string-aware scanner
  (`svelte_interpolations`) pulls the expressions out and parses them as JS.
- Directive names `use:action` / `transition:fn` / `in:` / `out:` / `animate:`
  reference imported values; the name token is now registered.
- Shorthand `bind:open` (no initializer) reads the local `open`.
- `{#snippet foo(param)}` params used only in the snippet body — noUnused
  FunctionParameters now consults EmbeddedValueReferences like the other rules.

Verified against a real SvelteKit codebase: 70 false positives → 0, while
genuinely-unused script bindings are still reported.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…port rules

An import used only as a type inside a template snippet — e.g. `icon: IconType`
in a `{#snippet}` parameter type — was flagged as unused. `EmbeddedValueReferences`
dropped type-only references (so `useImportType` could distinguish value vs type
usage), leaving them invisible to noUnusedImports/noUnusedVariables.

Track type-only references in a parallel channel. `useImportType` keeps using the
value-only set (unchanged); the unused-* rules now consult `is_used` (value OR
type). A genuinely-unused type import is still reported.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…h on directives, move tests

- Move attribute-string `{...}` interpolation extraction into parse_embedded_nodes
  so each is a tracked snippet, instead of re-parsing and discarding it in the
  references visitor.
- Replace the directive if/else chain with an exhaustive match on AnySvelteDirective.
- visit_html_root takes &HtmlFileSource instead of an is_svelte bool.
- Rename EmbeddedValueReferences fields to values/types, drop the contains helper.
- Move the Svelte CLI cases to analyzer spec fixtures.
- Trim comments and the changeset.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…UnusedVariables

Verifies that genuinely-unused script bindings are still flagged after
the embedded-reference tracking fix; previously only valid (clean) cases
existed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…ro templates

When an imported name appears only in type position inside a template
snippet (e.g. `{#snippet card(p: { icon: IconType })}`), the semantic
model of the <script> block has no references to it, so is_only_used_as_type
returned false and the rule stayed silent. Now it falls back to checking
the embedded type_references channel, correctly suggesting `import type`.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Covers the case where `import type { T }` is never referenced in either
the script or the template — it should still be reported by noUnusedImports.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…value_references.rs

Co-authored-by: Emanuele Stoppa <my.burning@gmail.com>

…olation test

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…e interpolation

Verifies that undeclared variables used in attribute interpolations like
{foo}px are flagged by noUndeclaredVariables.

…nt, add bind: tests

- Rename EmbeddedValueReferences::references to value_references (pairs
  cleaner with type_references)
- Restore the detailed doc comment on visit_html_root with examples
- Add unit tests for bind: shorthand (registers reference) and bind:
  with initializer (does not register directive name as reference)

…in templates

When a Svelte template expression like `{$errors.email}` references a
store subscription, only the `$errors` identifier was registered in the
embedded value references, so `is_used_as_value("errors")` returned
false and the bound variable `const { errors } = superForm(...)` was
incorrectly flagged as unused.

Fix: when building value references from Svelte non-source snippets, any
`$store`-style identifier that is not a Svelte rune also registers the
un-prefixed store name. The `$` prefix is stripped using
`TokenText::slice`, keeping the reference as a zero-copy view into the
same underlying token.

The server-side snippet collector is updated to use a Svelte-aware
builder for Svelte non-source snippets.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…ble() props in Svelte 5

In Svelte 5, assigning to a prop declared with $bindable() as its default
reflects the new value back to the parent component. Such props may be
write-only in the script block yet serve a real purpose, so flagging them
as unused variables is a false positive.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>