feat: persist last-used model in LocalStorage instead of preference

Drop the summaryModel preference (and the awkward textfield holding a
raw model ID nobody could discover without poking the SDK types). Each
AI view now controls its model dropdown, loads the shared
velum.ai.last-model on mount, and writes it back on submit — so picking
Claude 4.7 Opus in the summarize command becomes the prefilled default
in briefing, action-items, structured-data, and reply next time around.

Also drops 'model' from ReplyDefaults; the shared key supersedes it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/reply-email.tsx

@@ -12,7 +12,13 @@ import {
 } from "@raycast/api";
 import { getSelectedTextSafely } from "./selection";
 import { useEffect, useMemo, useRef, useState } from "react";
-import { CREATIVITY_OPTIONS, MODEL_OPTIONS } from "./ai";
+import {
+  CREATIVITY_OPTIONS,
+  DEFAULT_MODEL,
+  getLastUsedModel,
+  MODEL_OPTIONS,
+  setLastUsedModel,
+} from "./ai";
 import { getPreferences } from "./preferences";
 import {
   buildDisclosureContent,
@@ -65,7 +71,7 @@ export default function Command() {
   const [greeting, setGreeting] = useState("Lieber");
   const [signOff, setSignOff] = useState("Alles Liebe,");
   const [userFullName, setUserFullName] = useState(preferences.userFullName);
-  const [model, setModel] = useState(preferences.summaryModel);
+  const [model, setModel] = useState<string>(DEFAULT_MODEL);
   const [creativity, setCreativity] = useState<Creativity>("medium");
   const [disclosure, setDisclosure] = useState(false);
   const [isLoading, setIsLoading] = useState(true);
@@ -73,17 +79,20 @@ export default function Command() {
 
   useEffect(() => {
     async function load() {
-      const [loadedSessions, activeId, defaults] = await Promise.all([
-        listSessions(),
-        getActiveSessionId(),
-        loadReplyDefaults(),
-      ]);
+      const [loadedSessions, activeId, defaults, lastModel] = await Promise.all(
+        [
+          listSessions(),
+          getActiveSessionId(),
+          loadReplyDefaults(),
+          getLastUsedModel(),
+        ],
+      );
       setSessions(loadedSessions);
       setActiveSessionId(activeId);
+      setModel(lastModel);
 
       if (defaults.greeting) setGreeting(defaults.greeting);
       if (defaults.signOff) setSignOff(defaults.signOff);
-      if (defaults.model) setModel(defaults.model);
       if (defaults.creativity) setCreativity(defaults.creativity as Creativity);
       if (typeof defaults.disclosure === "boolean")
         setDisclosure(defaults.disclosure);
@@ -104,13 +113,12 @@ export default function Command() {
       }
     }
     load();
-  }, [preferences.summaryModel, preferences.userFullName]);
+  }, [preferences.userFullName]);
 
   function persist(
     overrides: Partial<{
       greeting: string;
       signOff: string;
-      model: string;
       creativity: Creativity;
       disclosure: boolean;
     }>,
@@ -118,7 +126,6 @@ export default function Command() {
     saveReplyDefaults({
       greeting: overrides.greeting ?? greeting,
       signOff: overrides.signOff ?? signOff,
-      model: overrides.model ?? model,
       creativity: overrides.creativity ?? creativity,
       disclosure: overrides.disclosure ?? disclosure,
     }).catch(() => {
@@ -173,10 +180,10 @@ export default function Command() {
       return;
     }
 
+    void setLastUsedModel(model);
     await saveReplyDefaults({
       greeting,
       signOff,
-      model,
       creativity,
       disclosure,
     });
@@ -358,10 +365,7 @@ export default function Command() {
         id="model"
         title="KI-Modell"
         value={model}
-        onChange={(v) => {
-          setModel(v);
-          persist({ model: v });
-        }}
+        onChange={setModel}
       >
         {MODEL_OPTIONS.map((option) => (
           <Form.Dropdown.Item
@@ -432,7 +436,6 @@ function ConfirmReply(props: StageProps) {
     await saveReplyDefaults({
       greeting,
       signOff,
-      model: props.model,
       creativity: props.creativity,
       disclosure,
     });
@@ -487,7 +490,6 @@ function ConfirmReply(props: StageProps) {
           saveReplyDefaults({
             greeting: v,
             signOff,
-            model: props.model,
             creativity: props.creativity,
             disclosure,
           }).catch(() => {});
@@ -510,7 +512,6 @@ function ConfirmReply(props: StageProps) {
           saveReplyDefaults({
             greeting,
             signOff: v,
-            model: props.model,
             creativity: props.creativity,
             disclosure,
           }).catch(() => {});
@@ -546,7 +547,6 @@ function ConfirmReply(props: StageProps) {
           saveReplyDefaults({
             greeting,
             signOff,
-            model: props.model,
             creativity: props.creativity,
             disclosure: v,
           }).catch(() => {});