docs: add v0.2.0 release notes

Amp-Thread-ID: https://ampcode.com/threads/T-019c0111-4304-7458-9044-b02f585d263d
Co-authored-by: Amp <amp@ampcode.com>

Author: rockorager

docs/releases/v0.2.0.md

@@ -0,0 +1,40 @@
+## What's New
+
+- **Type narrowing in templates**: Full support for discriminated unions, `{#if}` / `{:else if}` chains, and `{#each}` blocks with proper type narrowing propagation
+- **SvelteKit integration**: Automatic `PageData` type annotations for route files and generated types discovery
+- **Snippet improvements**: Proper narrowing context from `@render` call sites, `{@const}` bindings inside snippet bodies, and optional parameter handling
+- **Component prop validation**: Check required props, type mismatches, and `bind:` prop types
+- **CSS vendor prefix diagnostics**: Warn about compatibility issues with CSS vendor prefixes
+- **TypeScript file diagnostics**: Report errors from all `.ts` files in workspace, not just `.svelte` files
+- **`state_referenced_locally` warning**: Detect `$state()` variables referenced only in the defining scope
+- **`slot_element_deprecated` warning**: Warn about deprecated `<slot>` elements in Svelte 5 components
+
+## Bug Fixes
+
+- Fix false positives for destructured `@const` bindings and local types
+- Fix `state_referenced_locally` false positives for `$bindable` props, object property keys, and `$props()` rest patterns
+- Fix import source mapping for files with leading comments or scattered imports
+- Fix `typeof` type hoisting and layout `children` prop handling
+- Fix `style:` directive parsing and skip custom action events
+- Fix tsconfig filtering with relative workspace paths
+- Fix snippet narrowing for `{:else if}` branches and enclosing `if` conditions
+- Emit `const` for `{@const}` bindings to enable closure narrowing
+- Preserve arrow function props for type checking
+- Fix snippets in logic blocks not being treated as component props
+- Respect `// svelte-ignore` comments for `state_referenced_locally`
+- Fix callback parameter type inference
+- Transform Svelte 4 store assignment syntax to `set()` calls
+- Fix generic component props referencing out-of-scope type params
+- Fix `{#each}` binding scoping and destructuring with keyed expressions
+- Fix class directive parsing for Tailwind class names with dots/brackets
+- Handle pipe modifiers on transition directives
+- Fix brace matching in attribute expressions with comments
+- Import `Snippet` type globally for Svelte 5 compatibility
+- Fix discriminated union narrowing in template `if`/`else-if` chains
+- Detect unsupported TypeScript `enum` and `namespace` features
+
+## Installation
+
+```bash
+brew install ampcode/tap/zvelte-check
+```