Outsource custom GUI class components to dashgui library

Move reusable GUI primitives (PanelTile, EditablePanelTile, base Tile,
ElevatedPill, SingleLineTextEdit) into the shared dashgui package and
consume them via a file: dependency. EditablePanelTile now accepts an
onError prop so error notification stays app-side.

package-lock.json

@@ -16,6 +16,7 @@
         "@mui/material": "^9.2.0",
         "@reduxjs/toolkit": "^2.12.0",
         "@shopify/draggable": "^1.2.1",
+        "dashgui": "file:../dashgui",
         "notistack": "^3.0.2",
         "react": "^19.2.8",
         "react-dom": "^19.2.8",
@@ -31,6 +32,27 @@
         "vite-plugin-pwa": "^1.3.0"
       }
     },
+    "../dashgui": {
+      "version": "0.1.0",
+      "devDependencies": {
+        "@emotion/react": "^11.14.0",
+        "@emotion/styled": "^11.14.1",
+        "@mui/icons-material": "^9.2.0",
+        "@mui/material": "^9.2.0",
+        "@vitejs/plugin-react": "6.0.2",
+        "react": "^19.2.8",
+        "react-dom": "^19.2.8",
+        "vite": "^8.2.0"
+      },
+      "peerDependencies": {
+        "@emotion/react": "^11.14.0",
+        "@emotion/styled": "^11.14.1",
+        "@mui/icons-material": "^9.0.0",
+        "@mui/material": "^9.0.0",
+        "react": "^19.0.0",
+        "react-dom": "^19.0.0"
+      }
+    },
     "node_modules/@apideck/better-ajv-errors": {
       "version": "0.3.7",
       "resolved": "https://registry.npmjs.org/@apideck/better-ajv-errors/-/better-ajv-errors-0.3.7.tgz",
@@ -3575,6 +3597,10 @@
       "integrity": "sha512-z1HGKcYy2xA8AGQfwrn0PAy+PB7X/GSj3UVJW9qKyn43xWa+gl5nXmU4qqLMRzWVLFC8KusUX8T/0kCiOYpAIQ==",
       "license": "MIT"
     },
+    "node_modules/dashgui": {
+      "resolved": "../dashgui",
+      "link": true
+    },
     "node_modules/data-view-buffer": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/data-view-buffer/-/data-view-buffer-1.0.2.tgz",