✨ feat: add Svelte actions and global stores for enhanced functionality

frontend/src/lib/formContext.ts

@@ -0,0 +1,12 @@
+export const FORM_CONTEXT = Symbol("FORM_CONTEXT")
+
+export interface ValidatableField {
+    validate: () => Promise<boolean> | boolean
+    reset: () => void
+    focus?: () => void
+}
+
+export interface FormContext {
+    register: (field: ValidatableField) => void
+    unregister: (field: ValidatableField) => void
+}