feat: Reinitialize frontend with SvelteKit and TypeScript

- Delete old Vite+Svelte frontend
- Initialize new SvelteKit project with TypeScript
- Configure Tailwind CSS v4 + DaisyUI
- Implement JWT authentication with auto-refresh
- Create login page with form validation (Zod)
- Add protected route guards
- Update Docker configuration for single-stage build
- Add E2E tests with Playwright (6/11 passing)
- Fix Svelte 5 reactivity with $state() runes

Known issues:
- 5 E2E tests failing (timing/async issues)
- Token refresh implementation needs debugging
- Validation error display timing

frontend/node_modules/effect/src/MergeStrategy.ts

@@ -0,0 +1,124 @@
+/**
+ * @since 2.0.0
+ */
+import * as internal from "./internal/channel/mergeStrategy.js"
+
+/**
+ * @since 2.0.0
+ * @category symbols
+ */
+export const MergeStrategyTypeId: unique symbol = internal.MergeStrategyTypeId
+
+/**
+ * @since 2.0.0
+ * @category symbols
+ */
+export type MergeStrategyTypeId = typeof MergeStrategyTypeId
+
+/**
+ * @since 2.0.0
+ * @category models
+ */
+export type MergeStrategy = BackPressure | BufferSliding
+
+/**
+ * @since 2.0.0
+ */
+export declare namespace MergeStrategy {
+  /**
+   * @since 2.0.0
+   * @category models
+   */
+  export interface Proto {
+    readonly [MergeStrategyTypeId]: MergeStrategyTypeId
+  }
+}
+
+/**
+ * @since 2.0.0
+ * @category models
+ */
+export interface BackPressure extends MergeStrategy.Proto {
+  readonly _tag: "BackPressure"
+}
+
+/**
+ * @since 2.0.0
+ * @category models
+ */
+export interface BufferSliding extends MergeStrategy.Proto {
+  readonly _tag: "BufferSliding"
+}
+
+/**
+ * @since 2.0.0
+ * @category constructors
+ */
+export const BackPressure: (_: void) => MergeStrategy = internal.BackPressure
+
+/**
+ * @since 2.0.0
+ * @category constructors
+ */
+export const BufferSliding: (_: void) => MergeStrategy = internal.BufferSliding
+
+/**
+ * Returns `true` if the specified value is a `MergeStrategy`, `false`
+ * otherwise.
+ *
+ * @since 2.0.0
+ * @category refinements
+ */
+export const isMergeStrategy: (u: unknown) => u is MergeStrategy = internal.isMergeStrategy
+
+/**
+ * Returns `true` if the specified `MergeStrategy` is a `BackPressure`, `false`
+ * otherwise.
+ *
+ * @since 2.0.0
+ * @category refinements
+ */
+export const isBackPressure: (self: MergeStrategy) => self is BackPressure = internal.isBackPressure
+
+/**
+ * Returns `true` if the specified `MergeStrategy` is a `BufferSliding`, `false`
+ * otherwise.
+ *
+ * @since 2.0.0
+ * @category refinements
+ */
+export const isBufferSliding: (self: MergeStrategy) => self is BufferSliding = internal.isBufferSliding
+
+/**
+ * Folds an `MergeStrategy` into a value of type `A`.
+ *
+ * @since 2.0.0
+ * @category folding
+ */
+export const match: {
+  /**
+   * Folds an `MergeStrategy` into a value of type `A`.
+   *
+   * @since 2.0.0
+   * @category folding
+   */
+  <A>(
+   options: {
+     readonly onBackPressure: () => A
+     readonly onBufferSliding: () => A
+   }
+  ): (self: MergeStrategy) => A
+  /**
+   * Folds an `MergeStrategy` into a value of type `A`.
+   *
+   * @since 2.0.0
+   * @category folding
+   */
+  <A>(
+   self: MergeStrategy,
+   options: {
+     readonly onBackPressure: () => A
+     readonly onBufferSliding: () => A
+   }
+  ): A
+} = internal.match