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src/components/panels/EditablePanelTile.jsx

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+import { Component, createRef } from 'react';
+import CloseOutlinedIcon from '@mui/icons-material/CloseOutlined';
+import EditOutlinedIcon from '@mui/icons-material/EditOutlined';
+import SaveOutlinedIcon from '@mui/icons-material/SaveOutlined';
+import Alert from '@mui/material/Alert';
+import Box from '@mui/material/Box';
+import CircularProgress from '@mui/material/CircularProgress';
+import IconButton from '@mui/material/IconButton';
+import Paper from '@mui/material/Paper';
+import Typography from '@mui/material/Typography';
+import { enqueueSnackbar } from 'notistack';
+import { backendErrorFrom } from '../../utils/backendError';
+import { panelTilePaperSx } from './panelTileLayout';
+
+function valuesEqual(a, b) {
+  return JSON.stringify(a) === JSON.stringify(b);
+}
+
+/**
+ * Panel tile with centralized inline-edit chrome.
+ * Pass `onSave` to enable edit UI; omit it for read-only tiles (no edit icon).
+ */
+export class EditablePanelTile extends Component {
+  constructor(props) {
+    super(props);
+    this.inputRef = createRef();
+    this.state = {
+      editing: false,
+      draft: null,
+      saving: false,
+      error: null,
+    };
+  }
+
+  componentDidUpdate(_prevProps, prevState) {
+    if (!prevState.editing && this.state.editing) {
+      this.inputRef.current?.focus();
+    }
+  }
+
+  getSavedValue() {
+    return this.props.value;
+  }
+
+  isDirty() {
+    const { draft, editing } = this.state;
+    if (!editing || draft == null) return false;
+    if (this.props.isDirty) {
+      return this.props.isDirty(draft, this.getSavedValue());
+    }
+    return !valuesEqual(draft, this.getSavedValue());
+  }
+
+  canSave() {
+    const { draft, saving } = this.state;
+    if (saving || !this.isDirty() || draft == null) return false;
+    if (this.props.canSave) {
+      return this.props.canSave(draft, this.getSavedValue());
+    }
+    return true;
+  }
+
+  handleStartEdit = (event) => {
+    event.stopPropagation();
+    this.setState({
+      editing: true,
+      draft: structuredClone(this.getSavedValue()),
+      error: null,
+    });
+  };
+
+  handleCancel = (event) => {
+    event.stopPropagation();
+    this.setState({
+      editing: false,
+      draft: null,
+      error: null,
+    });
+  };
+
+  handleDraftChange = (nextDraft) => {
+    this.setState({ draft: nextDraft, error: null });
+  };
+
+  handleSave = async (event) => {
+    event.stopPropagation();
+    if (!this.canSave()) return;
+
+    const { onSave } = this.props;
+    const { draft } = this.state;
+    this.setState({ saving: true, error: null });
+
+    try {
+      await onSave(draft);
+      this.setState({ editing: false, draft: null, saving: false, error: null });
+      enqueueSnackbar('Gespeichert.', { variant: 'success' });
+    } catch (err) {
+      const normalized = backendErrorFrom(err);
+      this.setState({ saving: false, error: normalized.message });
+      enqueueSnackbar(normalized.message, { variant: 'error' });
+    }
+  };
+
+  renderTitle() {
+    const { title } = this.props;
+    const { editing } = this.state;
+    if (!title) return null;
+    return (
+      <Typography
+        variant="overline"
+        color="text.secondary"
+        sx={{ display: 'block', mb: 1, pr: editing ? 7 : 4 }}
+      >
+        {title}
+      </Typography>
+    );
+  }
+
+  renderActions() {
+    const { onSave } = this.props;
+    if (!onSave) return null;
+
+    const { editing, saving } = this.state;
+    const actionSx = {
+      position: 'absolute',
+      top: 4,
+      color: 'text.secondary',
+    };
+
+    if (!editing) {
+      return (
+        <IconButton
+          size="small"
+          onClick={this.handleStartEdit}
+          aria-label="Bearbeiten"
+          sx={{ ...actionSx, right: 4 }}
+        >
+          <EditOutlinedIcon fontSize="small" />
+        </IconButton>
+      );
+    }
+
+    return (
+      <>
+        <IconButton
+          size="small"
+          onClick={this.handleCancel}
+          disabled={saving}
+          aria-label="Abbrechen"
+          sx={{ ...actionSx, right: 40 }}
+        >
+          <CloseOutlinedIcon fontSize="small" />
+        </IconButton>
+        <IconButton
+          size="small"
+          onClick={this.handleSave}
+          disabled={!this.canSave()}
+          aria-label="Speichern"
+          color={this.canSave() ? 'primary' : 'default'}
+          sx={{ ...actionSx, right: 4 }}
+        >
+          {saving ? (
+            <CircularProgress size={18} color="inherit" />
+          ) : (
+            <SaveOutlinedIcon fontSize="small" />
+          )}
+        </IconButton>
+      </>
+    );
+  }
+
+  render() {
+    const {
+      wide = 1,
+      sx,
+      minHeight = 120,
+      renderDisplay,
+      renderEdit,
+    } = this.props;
+    const { editing, draft, error } = this.state;
+    const savedValue = this.getSavedValue();
+    const pending = this.isDirty();
+
+    return (
+      <Paper
+        variant="outlined"
+        sx={panelTilePaperSx({ wide, sx, minHeight, pending })}
+      >
+        {this.renderActions()}
+        {this.renderTitle()}
+        <Box sx={{ flex: 1, minWidth: 0, pr: editing ? 1 : 0 }}>
+          {editing && draft != null
+            ? renderEdit(draft, this.handleDraftChange, this.inputRef)
+            : renderDisplay(savedValue)}
+        </Box>
+        {error ? (
+          <Alert severity="error" sx={{ mt: 1, py: 0 }}>
+            {error}
+          </Alert>
+        ) : null}
+      </Paper>
+    );
+  }
+}