🔧 chore: create @manacore/shared-logger and migrate 2 mobile apps

- Create shared logger package with logger, perfLogger, networkLogger
- Support both __DEV__ (React Native) and NODE_ENV environments
- Migrate manadeck and picture mobile apps to use shared package

Savings: ~120 LOC (126 → 10 LOC in apps)

packages/shared-logger/src/index.ts

@@ -0,0 +1,108 @@
+/**
+ * Shared Logger Utilities for ManaCore Apps
+ * Provides consistent logging across mobile and web applications.
+ */
+
+// Check if we're in development mode
+// Works in both React Native (__DEV__) and Node.js environments
+declare const __DEV__: boolean | undefined;
+const isDevelopment =
+	typeof __DEV__ !== 'undefined' ? __DEV__ : process.env.NODE_ENV === 'development';
+
+/**
+ * Main logger object with standard log levels.
+ * Debug and info only log in development mode.
+ * Warn and error always log.
+ */
+export const logger = {
+	/** Log debug information (only in development) */
+	debug: (...args: unknown[]): void => {
+		if (isDevelopment) {
+			console.debug('[DEBUG]', ...args);
+		}
+	},
+
+	/** Log general information (only in development) */
+	info: (...args: unknown[]): void => {
+		if (isDevelopment) {
+			console.info('[INFO]', ...args);
+		}
+	},
+
+	/** Log warnings (always logged) */
+	warn: (...args: unknown[]): void => {
+		console.warn('[WARN]', ...args);
+	},
+
+	/** Log errors (always logged) */
+	error: (...args: unknown[]): void => {
+		console.error('[ERROR]', ...args);
+	},
+
+	/** Log success messages (only in development) */
+	success: (...args: unknown[]): void => {
+		if (isDevelopment) {
+			console.log('[SUCCESS]', ...args);
+		}
+	},
+
+	/** General log (only in development) */
+	log: (...args: unknown[]): void => {
+		if (isDevelopment) {
+			console.log('[LOG]', ...args);
+		}
+	},
+};
+
+/**
+ * Performance logger for measuring execution time.
+ * Only logs in development mode.
+ */
+export const perfLogger = {
+	/** Start a performance timer with a label */
+	start: (label: string): void => {
+		if (isDevelopment) {
+			console.time(label);
+		}
+	},
+
+	/** End a performance timer and log the duration */
+	end: (label: string): void => {
+		if (isDevelopment) {
+			console.timeEnd(label);
+		}
+	},
+};
+
+/**
+ * Network request logger for API debugging.
+ * Request and response only log in development.
+ * Errors always log.
+ */
+export const networkLogger = {
+	/** Log an outgoing network request */
+	request: (url: string, method: string, body?: unknown): void => {
+		if (isDevelopment) {
+			console.log(`[NETWORK] ${method} ${url}`, body ? { body } : '');
+		}
+	},
+
+	/** Log a network response */
+	response: (url: string, status: number, data?: unknown): void => {
+		if (isDevelopment) {
+			console.log(`[NETWORK] Response ${status} from ${url}`, data ? { data } : '');
+		}
+	},
+
+	/** Log a network error (always logged) */
+	error: (url: string, error: unknown): void => {
+		console.error(`[NETWORK] Error from ${url}`, error);
+	},
+};
+
+// Individual function exports for backwards compatibility with manadeck pattern
+export const debug = logger.debug;
+export const info = logger.info;
+export const warn = logger.warn;
+export const error = logger.error;
+export const log = logger.log;