feat: refine account management and targeted editing

Add local provider icons, larger compact account rows, the requested column order, and full username display while keeping secrets masked. Replace provider-wide editing with a row-specific editor that preserves sibling accounts, exact limits, live usage counters, and status metadata. Add targeted credential validation, release notices, and regression coverage.

tests/account-service-icons.test.ts

@@ -0,0 +1,34 @@
+import { readFile } from "node:fs/promises";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+import { ACCOUNT_SERVICE_ICONS } from "../src/renderer/account-service-icons";
+
+const services = [
+  "realdebrid",
+  "megadebrid-api",
+  "megadebrid-web",
+  "bestdebrid",
+  "alldebrid",
+  "ddownload",
+  "onefichier",
+  "debridlink",
+  "linksnappy"
+] as const;
+
+describe("account service icons", () => {
+  it("bundles a valid local PNG or ICO for every account service", async () => {
+    expect(Object.keys(ACCOUNT_SERVICE_ICONS).sort()).toEqual([...services].sort());
+    for (const service of services) {
+      const relativePath = ACCOUNT_SERVICE_ICONS[service];
+      expect(relativePath.startsWith("./provider-icons/")).toBe(true);
+      const bytes = await readFile(path.resolve("assets", relativePath.slice(2)));
+      const png = bytes.subarray(0, 8).equals(Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]));
+      const ico = bytes.subarray(0, 4).equals(Buffer.from([0x00, 0x00, 0x01, 0x00]));
+      expect(png || ico).toBe(true);
+    }
+  });
+
+  it("uses the same Mega-Debrid icon for API and Web accounts", () => {
+    expect(ACCOUNT_SERVICE_ICONS["megadebrid-api"]).toBe(ACCOUNT_SERVICE_ICONS["megadebrid-web"]);
+  });
+});