chore(storybook): switch to yarn and fix Storybook compatibility

- Switch from bun to yarn with node_modules linker
- Downgrade Svelte to 5.46.1 for Storybook compatibility
- Switch Storybook framework from @storybook/sveltekit to @storybook/svelte-vite
- Downgrade Storybook packages to 10.1.11
- Add FSD path aliases to vite.config.ts
- Add Svelte plugin to Storybook viteFinal to handle .svelte files

.yarnrc.yml

@@ -0,0 +1,3 @@
+# Disable Plug'n'Play, use node_modules
+nodeLinker: node-modules
+enableGlobalCache: false