docs: correct Flowbite aria-label note and relax TSDoc requirement

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

Author: KATO-Hiro

.claude/rules/accessibility.md

@@ -35,8 +35,9 @@ on open and restore it on close.
 
 ## Flowbite Svelte
 
-Omitting `color` on `<Button>` applies the filled green default and may strip
-`aria-label` on icon-only variants — always verify in browser DevTools Accessibility panel.
+Icon-only `<Button>` variants require an explicit `aria-label`; Flowbite Svelte does
+not generate one automatically. Omitting `color` only applies the `'primary'` default
+style — it has no effect on `aria-label`.
 
 ## Form Labels
 

.claude/rules/coding-style.md

@@ -53,7 +53,7 @@ Delete function only if: (1) zero callers, (2) replacement exists, (3) dependent
 
 - **Plans/dev-notes**: Japanese
 - **Code/commits/tests**: English
-- **TSDoc**: required on all exports
+- **TSDoc**: add when behavior, constraints, or params are non-obvious
 - **Code blocks**: specify language (`typescript`, `sql`, `bash`)
 
 ## Security