fix(drafts): make the home-page View/Edit JSON action work on draft-only apps

The "View/Edit JSON" entry on the home page called `AppService.getAppByPath`
without `get_draft=true`, so for draft-only items at `u/{user}/draft_{uuid}`
the backend 404'd with "App not found at path …". Pass `get_draft=true`
and render the synthesized stand-in's editable shape:

- App drafts come back as `{summary, value, path, policy, ...}` — `value`
  is the App definition the editor was working on; show that.
- Raw-app drafts come back as the flattened
  `{files, runnables, data, summary, policy, ...}` with no nested `value`;
  show the whole shape.

On save, draft-only items can't go through `updateApp` (no deployed row).
Route the edit through `UserDraftDbSyncer.save` (with `immediate: true`
so `await` resolves after the POST lands) and relabel the button
"Save draft" + Save icon. Deployed items keep the existing "Deploy"
flow unchanged.

frontend/src/lib/components/apps/editor/AppJsonEditor.svelte

@@ -6,16 +6,19 @@
 	import JsonEditor from '../../JsonEditor.svelte'
 	import { AppService } from '$lib/gen'
 	import { UserDraft } from '$lib/userDraft.svelte'
+	import { UserDraftDbSyncer } from '$lib/userDraftDbSyncer.svelte'
 	import { sendUserToast } from '$lib/toast'
 	import { userStore, workspaceStore } from '$lib/stores'
 	import { createEventDispatcher } from 'svelte'
-	import { Globe, Loader2 } from 'lucide-svelte'
+	import { Globe, Loader2, Save } from 'lucide-svelte'
 
 	let jsonViewerDrawer: Drawer | undefined = $state()
 
 	let code: string = $state('')
 	let path: string = ''
 	let loading = $state(true)
+	let isDraftOnly = $state(false)
+	let isRawApp = $state(false)
 	const dispatch = createEventDispatcher()
 
 	let app: any | undefined = undefined
@@ -24,24 +27,55 @@
 		loading = true
 		jsonViewerDrawer?.toggleDrawer()
 		path = path_l
-		const fapp = await AppService.getAppByPath({
+		// `get_draft=true` so draft-only items at `u/{user}/draft_{uuid}`
+		// resolve to the synthesized draft stand-in instead of 404'ing the
+		// home-page "View/Edit JSON" menu entry. Deployed apps continue to
+		// return the deployed payload unchanged (see WithDraftOverlay).
+		const fapp = (await AppService.getAppByPath({
 			workspace: $workspaceStore!,
-			path
-		})
+			path,
+			getDraft: true
+		})) as any
 		app = { ...fapp }
-		code = JSON.stringify(fapp.value, null, 4)
+		isDraftOnly = !!fapp.no_deployed
+		isRawApp = !!fapp.raw_app
+		// For deployed (or app drafts overlaid on a deployed row) the
+		// editable shape is the App definition under `.value`. For raw-app
+		// drafts there is no nested `.value` — the editable shape is the
+		// whole flattened draft (`{files, runnables, data, ...}`).
+		const display = isDraftOnly && isRawApp ? fapp : fapp.value
+		code = JSON.stringify(display, null, 4)
 		loading = false
 	}
 
 	export async function saveApp() {
-		await AppService.updateApp({
-			workspace: $workspaceStore!,
-			path,
-			requestBody: { ...app, value: JSON.parse(code) }
-		})
-		dispatch('change')
-		UserDraft.remove('app', path)
-		sendUserToast('App deployed')
+		const parsed = JSON.parse(code)
+		if (isDraftOnly) {
+			// Draft-only items have no deployed row — `updateApp` would
+			// 404. Route the edit through the syncer (`immediate: true`
+			// so the caller's `await` resolves only after the POST lands)
+			// so the user keeps editing under the draft path until they
+			// rename + deploy from the regular editor.
+			const value = isRawApp ? { ...app, ...parsed } : { ...app, value: parsed }
+			await UserDraftDbSyncer.save({
+				workspace: $workspaceStore!,
+				itemKind: isRawApp ? 'raw_app' : 'app',
+				path,
+				value,
+				immediate: true
+			})
+			dispatch('change')
+			sendUserToast('Draft saved')
+		} else {
+			await AppService.updateApp({
+				workspace: $workspaceStore!,
+				path,
+				requestBody: { ...app, value: parsed }
+			})
+			dispatch('change')
+			UserDraft.remove('app', path)
+			sendUserToast('App deployed')
+		}
 	}
 </script>
 
@@ -55,8 +89,13 @@
 
 		{#snippet actions()}
 			{#if !$userStore?.operator}
-				<Button on:click={saveApp} startIcon={{ icon: Globe }} variant="accent" size="xs">
-					Deploy
+				<Button
+					on:click={saveApp}
+					startIcon={{ icon: isDraftOnly ? Save : Globe }}
+					variant="accent"
+					size="xs"
+				>
+					{isDraftOnly ? 'Save draft' : 'Deploy'}
 				</Button>
 			{/if}
 		{/snippet}