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.

src/shared/preload-api.ts

@@ -84,7 +84,7 @@ export interface ElectronApi {
   importBestDebridCookies: () => Promise<number>;
   getAllDebridHostInfo: () => Promise<AllDebridHostInfo>;
   getDebridLinkHostLimits: () => Promise<DebridLinkHostLimitInfo[]>;
-  checkDebridAccounts: (settings?: AppSettings) => Promise<DebridAccountStatus[]>;
+  checkDebridAccounts: (settings?: AppSettings, persistValidOverride?: boolean, expectedAccountId?: string) => Promise<DebridAccountStatus[]>;
   checkMegaDebridAccount: (login: string, password: string) => Promise<DebridAccountStatus | null>;
   retryExtraction: (packageId: string) => Promise<void>;
   extractNow: (packageId: string) => Promise<void>;