feat: implement websocket-stream for journal server

Integrate `websocket-stream` to handle MQTT broker upgrades in the
CLI and add granular connection status tracking to the UI.

- Add `websocket-stream` dependency
- Update CLI to use `websocket-stream` for socket upgrades
- Enhance `journalStream` store with `connectionStatus` and
  `connectionError` states
- Add visual connection status indicators to `App` and `JournalPanel`

package-lock.json

@@ -29,6 +29,7 @@
         "solid-js": "^1.9.3",
         "three": "^0.183.2",
         "three-3mf-exporter": "^45.1.0",
+        "websocket-stream": "^5.5.2",
         "ws": "^8.21.0",
         "yarn-spinner-loader": "^0.1.0",
         "zod": "^4.4.3"
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       "license": "Python-2.0"
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+    "node_modules/async-limiter": {
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+      "license": "MIT"
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@@ -5260,6 +5267,18 @@
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       }
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+    "node_modules/duplexify": {
+      "version": "3.7.1",
+      "resolved": "https://registry.npmjs.org/duplexify/-/duplexify-3.7.1.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "end-of-stream": "^1.0.0",
+        "inherits": "^2.0.1",
+        "readable-stream": "^2.0.0",
+        "stream-shift": "^1.0.0"
+      }
+    },
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@@ -5287,6 +5306,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/end-of-stream": {
+      "version": "1.4.5",
+      "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.5.tgz",
+      "integrity": "sha512-ooEGc6HP26xXq/N+GCGOT0JKCLDGrq2bQUZrQ7gyrJiZANJ/8YDTxTpQBXGMn+WbIQXNVpyWymm7KYVICQnyOg==",
+      "license": "MIT",
+      "dependencies": {
+        "once": "^1.4.0"
+      }
+    },
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-      "dev": true,
       "license": "ISC",
       "dependencies": {
         "wrappy": "1"
@@ -9756,6 +9783,12 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/stream-shift": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/stream-shift/-/stream-shift-1.0.3.tgz",
+      "integrity": "sha512-76ORR0DO1o1hlKwTbi/DM3EXWGf3ZJYO8cXX5RJwnul2DEg2oyoZyjLNoQM8WsvZiFKCRfC1O0J7iCvie3RZmQ==",
+      "license": "MIT"
+    },
     "node_modules/string_decoder": {
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       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
@@ -10264,6 +10297,12 @@
         "node": ">=0.8.0"
       }
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+    "node_modules/ultron": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.1.1.tgz",
+      "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og==",
+      "license": "MIT"
+    },
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@@ -10547,6 +10586,31 @@
         "node": ">=12"
       }
     },
+    "node_modules/websocket-stream": {
+      "version": "5.5.2",
+      "resolved": "https://registry.npmjs.org/websocket-stream/-/websocket-stream-5.5.2.tgz",
+      "integrity": "sha512-8z49MKIHbGk3C4HtuHWDtYX8mYej1wWabjthC/RupM9ngeukU4IWoM46dgth1UOS/T4/IqgEdCDJuMe2039OQQ==",
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "duplexify": "^3.5.1",
+        "inherits": "^2.0.1",
+        "readable-stream": "^2.3.3",
+        "safe-buffer": "^5.1.2",
+        "ws": "^3.2.0",
+        "xtend": "^4.0.0"
+      }
+    },
+    "node_modules/websocket-stream/node_modules/ws": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
+      "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
+      "license": "MIT",
+      "dependencies": {
+        "async-limiter": "~1.0.0",
+        "safe-buffer": "~5.1.0",
+        "ultron": "~1.1.0"
+      }
+    },
     "node_modules/whatwg-encoding": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-2.0.0.tgz",
@@ -10677,7 +10741,6 @@
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-      "dev": true,
       "license": "ISC"
     },
     "node_modules/write-file-atomic": {