frontend: orange Upload button when panel is dirty

Match the unsaved-changes dot: the Upload button uses the warning color
while the panel has unedited changes, primary otherwise.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/components/DetectorSettings.tsx

@@ -417,7 +417,7 @@ function DetectorSettings({s: serverS}: MyProps) {
             <Grid item xs={1}/>
             <Grid item xs={1}/>
             <Grid item xs={10}>
-                <Button color="primary" variant="contained" disableElevation
+                <Button color={dirty ? "warning" : "primary"} variant="contained" disableElevation
                         onClick={() => submit(s)}
                         disabled={pending
                             || countTimeErr

frontend/src/components/SettingsPanel.tsx

@@ -67,7 +67,7 @@ function SettingsPanel({
                 {title !== undefined && <PanelTitle title={title} variant={titleVariant} dirty={dirty} />}
                 {children}
                 {onUpload && (
-                    <Button variant="contained" color="primary" disableElevation
+                    <Button variant="contained" color={dirty ? "warning" : "primary"} disableElevation
                             onClick={onUpload} disabled={uploadDisabled}>
                         {uploadText}
                     </Button>