test: add component logic tests and clean up eslint directives

Adds mirror-function tests for five Svelte components (HighlightedText,
CliVersion, AchievementNotification, StatusBar, ConversationTabs) and
removes stale eslint-disable comments from existing store test files.

src/lib/stores/character.test.ts

@@ -1,4 +1,3 @@
-/* eslint-disable max-lines-per-function -- Test suites naturally have many cases */
 import { describe, it, expect, beforeEach, vi, afterEach } from "vitest";
 import { get } from "svelte/store";
 import { characterState, characterInfo } from "./character";
@@ -26,7 +25,17 @@ describe("characterState store", () => {
     });
 
     it("can set any valid state", () => {
-      const states = ["idle", "thinking", "typing", "coding", "searching", "mcp", "permission", "success", "error"] as const;
+      const states = [
+        "idle",
+        "thinking",
+        "typing",
+        "coding",
+        "searching",
+        "mcp",
+        "permission",
+        "success",
+        "error",
+      ] as const;
       for (const state of states) {
         characterState.setState(state);
         expect(get(characterState)).toBe(state);

src/lib/stores/costTracking.test.ts

@@ -1,4 +1,3 @@
-/* eslint-disable max-lines-per-function -- Test suites naturally have many cases */
 import { describe, it, expect } from "vitest";
 import {
   formatCost,

src/lib/stores/notifications.test.ts

@@ -1,4 +1,3 @@
-/* eslint-disable @typescript-eslint/init-declarations -- Variables reassigned in beforeEach */
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 import { writable } from "svelte/store";
 

src/lib/stores/search.test.ts

@@ -1,4 +1,3 @@
-/* eslint-disable max-lines-per-function -- Test suites naturally have many cases */
 import { describe, it, expect, beforeEach } from "vitest";
 import { get } from "svelte/store";
 import { searchState, isSearchActive, searchQuery } from "./search";