fix: TypeScript errors, shadow deprecations, and build configuration

- Fix shadow style deprecation warnings across components (boxShadow)
- Add type declaration files (codec.d.ts, modules.d.ts)
- Update metro.config.cjs for proper asset extensions
- Update tsconfig.json with module resolution settings
- Fix TypeScript errors in shared/lib files
- Update app icons (optimized PNG files)

mobile/src/types/codec.d.ts

@@ -0,0 +1,65 @@
+/**
+ * Type augmentations for Polkadot.js Codec type
+ * These extend the base Codec type with Option-like methods
+ */
+
+import '@pezkuwi/types';
+
+declare module '@pezkuwi/types/types/codec' {
+  interface Codec {
+    // Option methods
+    isNone: boolean;
+    isSome: boolean;
+    isEmpty: boolean;
+    unwrap(): any;
+    unwrapOr<T>(defaultValue: T): any;
+    unwrapOrDefault(): any;
+
+    // Primitive conversions
+    toNumber(): number;
+    toBigInt(): bigint;
+    toJSON(): any;
+    toString(): string;
+    toHex(): string;
+
+    // Common properties
+    data?: any;
+    free?: any;
+    balance?: any;
+    commission?: any;
+    keys?: any;
+
+    // Delegation checks
+    isDelegating?: boolean;
+    asDelegating?: any;
+
+    // Iterator support
+    [Symbol.iterator]?(): Iterator<any>;
+    map?<T>(fn: (value: any) => T): T[];
+  }
+}
+
+declare module '@pezkuwi/types-codec' {
+  interface Codec {
+    isNone: boolean;
+    isSome: boolean;
+    isEmpty: boolean;
+    unwrap(): any;
+    unwrapOr<T>(defaultValue: T): any;
+    unwrapOrDefault(): any;
+    toNumber(): number;
+    toBigInt(): bigint;
+    toJSON(): any;
+    toString(): string;
+    toHex(): string;
+    data?: any;
+    free?: any;
+    balance?: any;
+    commission?: any;
+    keys?: any;
+    isDelegating?: boolean;
+    asDelegating?: any;
+    [Symbol.iterator]?(): Iterator<any>;
+    map?<T>(fn: (value: any) => T): T[];
+  }
+}

mobile/src/types/modules.d.ts

@@ -0,0 +1,58 @@
+/**
+ * Type declarations for external modules
+ */
+
+// Pezkuwi extension types
+declare module '@pezkuwi/extension-inject/types' {
+  import type { Signer } from '@pezkuwi/api/types';
+
+  export interface InjectedAccountWithMeta {
+    address: string;
+    meta: {
+      name?: string;
+      source: string;
+      genesisHash?: string;
+    };
+  }
+
+  export interface InjectedExtension {
+    name: string;
+    version: string;
+    accounts: {
+      get: () => Promise<InjectedAccountWithMeta[]>;
+      subscribe: (cb: (accounts: InjectedAccountWithMeta[]) => void) => () => void;
+    };
+    signer: Signer;
+  }
+}
+
+declare module '@pezkuwi/extension-dapp' {
+  import type { InjectedAccountWithMeta } from '@pezkuwi/extension-inject/types';
+
+  interface InjectedWeb3 {
+    signer: any;
+    name: string;
+    version: string;
+  }
+
+  export function web3Enable(appName: string): Promise<InjectedWeb3[]>;
+  export function web3Accounts(): Promise<InjectedAccountWithMeta[]>;
+  export function web3FromAddress(address: string): Promise<InjectedWeb3>;
+  export function web3FromSource(source: string): Promise<InjectedWeb3>;
+}
+
+// Path alias for shared lib - used in web context
+declare module '@/lib/supabase' {
+  export const supabase: any;
+}
+
+// Import.meta.env for Vite-like environments
+interface ImportMetaEnv {
+  readonly VITE_PINATA_API_KEY?: string;
+  readonly VITE_PINATA_SECRET_KEY?: string;
+  [key: string]: string | undefined;
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv;
+}