feat: broadcast notification target + UX improvements

Add broadcast target type that fans out notifications to multiple
child targets. Dispatch expands broadcast into children in
load_link_data() — dispatcher stays unaware. Children can be
toggled on/off via disabled_child_ids in config.

Also: dashboard provider card smaller font for names, scroll-to-form
on target edit, broadcast nav tab with counter, flag_modified fix
for JSON column updates, CLAUDE.md nav tree docs.

frontend/src/routes/targets/TargetForm.svelte

@@ -6,6 +6,7 @@
 	import Hint from '$lib/components/Hint.svelte';
 	import IconGridSelect from '$lib/components/IconGridSelect.svelte';
 	import EntitySelect from '$lib/components/EntitySelect.svelte';
+	import MultiEntitySelect from '$lib/components/MultiEntitySelect.svelte';
 	import type { EntityItem } from '$lib/components/EntitySelect.svelte';
 	import type { GridItem } from '$lib/components/IconGridSelect.svelte';
 
@@ -28,6 +29,7 @@
 			auth_token: string;
 			matrix_bot_id: number;
 			email_bot_id: number;
+			child_target_ids: number[];
 		};
 		formType: string;
 		activeType: string | null;
@@ -36,6 +38,7 @@
 		emailBotItems: EntityItem[];
 		matrixBotItems: EntityItem[];
 		chatActionItems: GridItem[];
+		broadcastChildItems?: { value: number; label: string; icon: string; desc: string }[];
 		telegramBotCount: number;
 		emailBotCount: number;
 		matrixBotCount: number;
@@ -56,6 +59,7 @@
 		emailBotItems,
 		matrixBotItems,
 		chatActionItems,
+		broadcastChildItems = [],
 		telegramBotCount,
 		emailBotCount,
 		matrixBotCount,
@@ -160,6 +164,20 @@
 					<p class="text-xs text-[var(--color-muted-foreground)] mt-1">{t('matrixBot.noBots')} <a href="/bots?tab=matrix" class="underline">→</a></p>
 				{/if}
 			</div>
+		{:else if formType === 'broadcast'}
+			{@const childIds = (form.child_target_ids || []).map(String)}
+			<div>
+				<label class="block text-sm font-medium mb-1">{t('targets.selectChildTargets')}</label>
+				<MultiEntitySelect
+					items={broadcastChildItems?.map(i => ({ value: String(i.value), label: i.label, icon: i.icon, desc: i.desc })) ?? []}
+					values={childIds}
+					onchange={(vals) => form.child_target_ids = vals.map(Number)}
+					placeholder={t('targets.selectChildTargets')}
+				/>
+				{#if broadcastChildItems?.length === 0}
+					<p class="text-xs text-[var(--color-muted-foreground)] mt-1">{t('targets.noChildTargetsAvailable')}</p>
+				{/if}
+			</div>
 		{/if}
 
 		{#if formType === 'telegram'}