refactor(useFilenamingConvention): accept filename in unicase (#3356)

CHANGELOG.md

@@ -55,6 +55,20 @@ our [guidelines for writing a good changelog entry](https://github.com/biomejs/b
 
   Contributed by @Conaclos
 
+- [useFilenamingConvention](https://biomejs.dev/linter/rules/use-filenaming-convention) now supports [unicase](https://en.wikipedia.org/wiki/Unicase) letters.
+
+  [unicase](https://en.wikipedia.org/wiki/Unicase) letters have a single case: they are neither uppercase nor lowercase.
+  Biome now accepts filenames in unicase.
+  For example, the filename `안녕하세요` is now accepted.
+
+  We still reject a name that mixes unicase characters with lowercase or uppercase characters.
+  For example, the filename `A안녕하세요` is rejected.
+
+  This change also fixes [#3353](https://github.com/biomejs/biome/issues/3353).
+  Filenames consisting only of numbers are now accepted.
+
+  Contributed by @Conaclos
+
 #### Bug fixes
 
 - Don't request alt text for elements hidden from assistive technologies ([#3316](https://github.com/biomejs/biome/issues/3316)). Contributed by @robintown

crates/biome_js_analyze/src/lint/style/use_filenaming_convention.rs

@@ -34,7 +34,7 @@ declare_lint_rule! {
     ///
     /// ## Ignoring some files
     ///
-    /// Sometimes you want to completly ignore some files.
+    /// Sometimes you want to completely ignore some files.
     /// Biome ignore comments cannot be used because the rule applies on filenames not file contents.
     /// To ignore files, you can use [`overrides`](https://biomejs.dev/reference/configuration/#overrides).
     /// If you want to ignore all files in the `test` directory, then you can disable the rule for those files only:
@@ -151,7 +151,7 @@ impl Rule for UseFilenamingConvention {
         if !allowed_cases.is_empty() {
             let trimmed_name = name.trim_matches('_');
             let case = Case::identify(trimmed_name, options.strict_case);
-            if allowed_cases.contains(case) {
+            if (allowed_cases | Case::Uni).contains(case) {
                 return None;
             }
         }

crates/biome_js_analyze/tests/specs/style/useFilenamingConvention/_404.tsx.snap

@@ -0,0 +1,8 @@
+---
+source: crates/biome_js_analyze/tests/spec_tests.rs
+expression: _404.tsx
+---
+# Input
+```tsx
+
+```

crates/biome_js_analyze/tests/specs/style/useFilenamingConvention/안녕하세요.js.snap

@@ -0,0 +1,8 @@
+---
+source: crates/biome_js_analyze/tests/spec_tests.rs
+expression: 안녕하세요.js
+---
+# Input
+```jsx
+
+```