fix: deleted user handling

src/lib/components/workspace/Knowledge.svelte

@@ -165,12 +165,14 @@
 						<div class="mt-3 flex justify-between">
 							<div class="text-xs text-gray-500">
 								<Tooltip
-									content={item?.user?.email}
+									content={item?.user?.email ?? $i18n.t('Deleted User')}
 									className="flex shrink-0"
 									placement="top-start"
 								>
 									{$i18n.t('By {{name}}', {
-										name: capitalizeFirstLetter(item?.user?.name ?? item?.user?.email)
+										name: capitalizeFirstLetter(
+											item?.user?.name ?? item?.user?.email ?? $i18n.t('Deleted User')
+										)
 									})}
 								</Tooltip>
 							</div>

src/lib/components/workspace/Models.svelte

@@ -279,10 +279,16 @@
 
 				<div class="flex justify-between items-center -mb-0.5 px-0.5">
 					<div class=" text-xs mt-0.5">
-						<Tooltip content={model?.user?.email} className="flex shrink-0" placement="top-start">
+						<Tooltip
+							content={model?.user?.email ?? $i18n.t('Deleted User')}
+							className="flex shrink-0"
+							placement="top-start"
+						>
 							<div class="shrink-0 text-gray-500">
 								{$i18n.t('By {{name}}', {
-									name: capitalizeFirstLetter(model?.user?.name ?? model?.user?.email)
+									name: capitalizeFirstLetter(
+										model?.user?.name ?? model?.user?.email ?? $i18n.t('Deleted User')
+									)
 								})}
 							</div>
 						</Tooltip>

src/lib/components/workspace/Prompts.svelte

@@ -155,13 +155,15 @@
 
 						<div class=" text-xs px-0.5">
 							<Tooltip
-								content={prompt?.user?.email}
+								content={prompt?.user?.email ?? $i18n.t('Deleted User')}
 								className="flex shrink-0"
 								placement="top-start"
 							>
 								<div class="shrink-0 text-gray-500">
 									{$i18n.t('By {{name}}', {
-										name: capitalizeFirstLetter(prompt?.user?.name ?? prompt?.user?.email)
+										name: capitalizeFirstLetter(
+											prompt?.user?.name ?? prompt?.user?.email ?? $i18n.t('Deleted User')
+										)
 									})}
 								</div>
 							</Tooltip>

src/lib/components/workspace/Tools.svelte

@@ -251,12 +251,14 @@
 
 								<div class="text-xs text-gray-500 shrink-0">
 									<Tooltip
-										content={tool?.user?.email}
+										content={tool?.user?.email ?? $i18n.t('Deleted User')}
 										className="flex shrink-0"
 										placement="top-start"
 									>
 										{$i18n.t('By {{name}}', {
-											name: capitalizeFirstLetter(tool?.user?.name ?? tool?.user?.email)
+											name: capitalizeFirstLetter(
+												tool?.user?.name ?? tool?.user?.email ?? $i18n.t('Deleted User')
+											)
 										})}
 									</Tooltip>
 								</div>