fix(frontend): drop in-memory handle before reloading after DB-draft discard

When the "Script/flow loaded from latest saved draft" toast's
"Reset to deployed" action ran, it:
1. Deleted the DB draft via DraftService.deleteDraft.
2. Called UserDraft.remove (clears localStorage only).
3. Called goto + loadScript / loadFlow.

But the handle's in-memory state still held the now-deleted DB draft
and its meta (remoteDraftRev pointing at the gone draft's created_at).
On the reload, the editor's loadScript/loadFlow saw `localDraft !=
undefined` and ran the staleness check, which compared
`meta.remoteDraftRev = <old timestamp>` against
`currentDraftRev = undefined`. Verdict: "version" stale → spurious
"A newer version was deployed on the server" modal, even though
nothing on the server actually moved. The editor visibly froze
behind the modal because the in-memory state wasn't refreshed.

Drop the in-memory state with `handle.setDraftAndMeta(undefined, {})`
before the reload — same fix already applied to the
"Restored from local storage > Reset to deployed" toast action.

apps/edit and apps_raw/edit's "discard draft" actions don't call
DraftService.deleteDraft (they just swap the in-memory view to the
deployed branch), so they don't hit this codepath.

frontend/src/routes/(root)/(logged)/flows/edit/[...path]/+page.svelte

@@ -244,6 +244,14 @@
 						path: flow.path
 					})
 					UserDraft.remove('flow', flowDraftPath)
+					// UserDraft.remove only clears localStorage. The
+					// flowHandle's in-memory state still holds the now-
+					// deleted DB draft + its meta — loadFlow would treat it
+					// as a local autosave and the staleness check would fire
+					// a spurious "newer version was deployed" modal because
+					// remoteDraftRev moved from "defined" to "undefined".
+					// Drop the in-memory state first.
+					flowHandle.setDraftAndMeta(undefined, {})
 					nobackenddraft = true
 					loadFlow()
 				}

frontend/src/routes/(root)/(logged)/scripts/edit/[...path]/+page.svelte

@@ -235,6 +235,14 @@
 							path: bakedBaseline.path
 						})
 						UserDraft.remove('script', draftPath)
+						// UserDraft.remove only clears localStorage. The
+						// scriptHandle's in-memory state still holds the now-
+						// deleted DB draft + its meta — loadScript would treat
+						// it as a local autosave and the staleness check
+						// would fire a spurious "newer version was deployed"
+						// modal because remoteDraftRev moved from "defined"
+						// to "undefined". Drop the in-memory state first.
+						scriptHandle.setDraftAndMeta(undefined, {})
 						goto(`/scripts/edit/${bakedBaseline.path}`)
 						loadScript()
 					}