feat(frontend): autogenerate entity names from type/provider

Mirror the providers form pattern (defaultName tied to type) across
bots, targets, trackers, actions, and configs. Each form now derives
form.name from the selected type or provider while the user hasn't
manually edited it; switching to edit-mode flips the manualEdited
flag so existing names are preserved.

Defaults: bots → "<Type> Bot"; targets → type label; notification
trackers → "<provider> Tracker"; command trackers → "<provider>
Commands"; actions → "<provider> <Action Type>"; tracking/template/
command/command-template configs → "<descriptor.defaultName>
<Suffix>". TargetForm and TrackerForm grew an optional onnameinput
prop so parents can flag manual edits in subform inputs.

frontend/src/routes/targets/+page.svelte

@@ -129,6 +129,7 @@
 		child_target_ids: [] as number[],
 	});
 	let form = $state(defaultForm());
+	let nameManuallyEdited = $state(false);
 	let error = $state('');
 	let loaded = $state(false);
 	let submitting = $state(false);
@@ -137,6 +138,17 @@
 	let confirmDelete = $state<NotificationTarget | null>(null);
 	let formEl = $state<HTMLElement | undefined>();
 
+	const TARGET_TYPE_DEFAULT_NAMES: Record<TargetType, string> = {
+		telegram: 'Telegram', webhook: 'Webhook', email: 'Email',
+		discord: 'Discord', slack: 'Slack', ntfy: 'ntfy', matrix: 'Matrix',
+		broadcast: 'Broadcast',
+	};
+	$effect(() => {
+		if (showForm && !nameManuallyEdited && !editing) {
+			form.name = TARGET_TYPE_DEFAULT_NAMES[formType] ?? '';
+		}
+	});
+
 	async function scrollToForm() {
 		await tick();
 		formEl?.scrollIntoView({ behavior: 'smooth', block: 'start' });
@@ -213,6 +225,7 @@
 		if (formType === 'telegram' && telegramBots.length > 0) form.bot_id = telegramBots[0].id;
 		if (formType === 'email' && emailBots.length > 0) form.email_bot_id = emailBots[0].id;
 		if (formType === 'matrix' && matrixBots.length > 0) form.matrix_bot_id = matrixBots[0].id;
+		nameManuallyEdited = false;
 		editing = null;
 		showTelegramSettings = false;
 		showForm = true;
@@ -242,6 +255,7 @@
 			// broadcast
 			child_target_ids: c.child_target_ids || [],
 		};
+		nameManuallyEdited = true;
 		editing = tgt.id;
 		showTelegramSettings = false;
 		showForm = true;
@@ -476,6 +490,7 @@
 		bind:showTelegramSettings
 		onsave={save}
 		ontoggleTelegramSettings={() => showTelegramSettings = !showTelegramSettings}
+		onnameinput={() => nameManuallyEdited = true}
 	/>
 {/if}