Fix markdown streaming duplication by splitting newlines first

- Added string-width library for proper terminal column width calculation
- Fixed wrapLine() to split by newlines before wrapping (like Text component)
- Fixed Loader interval leak by stopping before container removal
- Changed loader message from 'Loading...' to 'Working...'

package-lock.json

@@ -3132,6 +3132,18 @@
 				"node": "6.* || 8.* || >= 10.*"
 			}
 		},
+		"node_modules/get-east-asian-width": {
+			"version": "1.4.0",
+			"resolved": "https://registry.npmjs.org/get-east-asian-width/-/get-east-asian-width-1.4.0.tgz",
+			"integrity": "sha512-QZjmEOC+IT1uk6Rx0sX22V6uHWVwbdbxf1faPqJ1QhLdGgsRGCZoyaQBm/piRdJy/D2um6hM1UP7ZEeQ4EkP+Q==",
+			"license": "MIT",
+			"engines": {
+				"node": ">=18"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/sindresorhus"
+			}
+		},
 		"node_modules/get-tsconfig": {
 			"version": "4.10.1",
 			"resolved": "https://registry.npmjs.org/get-tsconfig/-/get-tsconfig-4.10.1.tgz",
@@ -5513,7 +5525,8 @@
 				"@types/mime-types": "^2.1.4",
 				"chalk": "^5.5.0",
 				"marked": "^15.0.12",
-				"mime-types": "^3.0.1"
+				"mime-types": "^3.0.1",
+				"string-width": "^8.1.0"
 			},
 			"devDependencies": {
 				"@xterm/headless": "^5.5.0",
@@ -5523,6 +5536,18 @@
 				"node": ">=20.0.0"
 			}
 		},
+		"packages/tui/node_modules/ansi-regex": {
+			"version": "6.2.2",
+			"resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
+			"integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
+			"license": "MIT",
+			"engines": {
+				"node": ">=12"
+			},
+			"funding": {
+				"url": "https://github.com/chalk/ansi-regex?sponsor=1"
+			}
+		},
 		"packages/tui/node_modules/chalk": {
 			"version": "5.6.2",
 			"resolved": "https://registry.npmjs.org/chalk/-/chalk-5.6.2.tgz",
@@ -5545,6 +5570,37 @@
 				"node": ">= 18"
 			}
 		},
+		"packages/tui/node_modules/string-width": {
+			"version": "8.1.0",
+			"resolved": "https://registry.npmjs.org/string-width/-/string-width-8.1.0.tgz",
+			"integrity": "sha512-Kxl3KJGb/gxkaUMOjRsQ8IrXiGW75O4E3RPjFIINOVH8AMl2SQ/yWdTzWwF3FevIX9LcMAjJW+GRwAlAbTSXdg==",
+			"license": "MIT",
+			"dependencies": {
+				"get-east-asian-width": "^1.3.0",
+				"strip-ansi": "^7.1.0"
+			},
+			"engines": {
+				"node": ">=20"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/sindresorhus"
+			}
+		},
+		"packages/tui/node_modules/strip-ansi": {
+			"version": "7.1.2",
+			"resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.1.2.tgz",
+			"integrity": "sha512-gmBGslpoQJtgnMAvOVqGZpEz9dyoKTCzy2nfz/n8aIFhN/jCE/rCmcxabB6jOOHV+0WNnylOxaxBQPSvcWklhA==",
+			"license": "MIT",
+			"dependencies": {
+				"ansi-regex": "^6.0.1"
+			},
+			"engines": {
+				"node": ">=12"
+			},
+			"funding": {
+				"url": "https://github.com/chalk/strip-ansi?sponsor=1"
+			}
+		},
 		"packages/web-ui": {
 			"name": "@mariozechner/pi-web-ui",
 			"version": "0.5.48",