Skip no-op saves in the edit dialogs; clear a stale model-spec error

A Save that changed nothing still sent a PATCH, which bumped the row's
version and landed an "Edited garden settings" step in History that undid
nothing — the drift is gone since the last commit, but the write was still
there. Both dialogs now close without a request when every field matches
the loaded row.

In Settings, a rejected model spec's reason stayed under the field after
the field was blanked back to the saved value; committing an unchanged
value now clears it.

Co-Authored-By: Claude Fable 5 <[email protected]>

web/src/components/gardens/GardenDialog.tsx

@@ -98,6 +98,13 @@ export function GardenDialog({ garden, onClose }: { garden?: Garden; onClose: ()
       return
     }
     const input = { name: name.trim(), widthCm, heightCm, unitPref: unit, notes: notes.trim(), gridSizeCm, snapToGrid }
+    // Nothing changed: close without a request. A PATCH that writes the same
+    // row still bumps the version and lands an "Edited garden settings" step
+    // in History that undoes nothing.
+    if (isEdit && (Object.keys(input) as (keyof typeof input)[]).every((k) => input[k] === garden[k])) {
+      onClose()
+      return
+    }
     try {
       if (isEdit) await update.mutateAsync({ id: garden.id, ...input, version })
       else await create.mutateAsync(input)

web/src/components/plants/PlantDialog.tsx

@@ -99,6 +99,12 @@ export function PlantDialog({
       vendor: vendor.trim(),
       notes: notes.trim(),
     }
+    // Nothing changed: close without a request, so a look-and-Save doesn't bump
+    // the version for every garden that shares the plant.
+    if (isEdit && (Object.keys(input) as (keyof PlantInput)[]).every((k) => input[k] === (k === 'color' ? expandHex(plant.color) : plant[k]))) {
+      onClose()
+      return
+    }
     try {
       if (isEdit) await update.mutateAsync({ id: plant.id, ...input, version })
       else await create.mutateAsync(input)

web/src/pages/SettingsPage.tsx

@@ -171,6 +171,9 @@ function AssistantCard({ data }: { data: SettingsResponse }) {
   const commit = (field: ModelField, value: string) => {
     const v = value.trim()
     if (v !== settings[field]) save({ [field]: v })
+    // Back to what's saved (the typo was cleared): nothing to send, and the
+    // old reason would be about a value no longer in the field.
+    else setFieldError((e) => (e?.field === field ? null : e))
   }
   const errorFor = (field: ModelField) =>
     fieldError?.field === field ? <span className="text-accent-700">{fieldError.message}</span> : null