Fix CORS restrictions and development server configuration

Remove CORS headers to enable universal image support and fix local API server settings.

## Changes

**Remove CORS Headers**
- Remove Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy headers
- Enables images from any domain (Facebook, Medium, arbitrary websites)
- Database falls back to IndexedDB mode (minimal performance impact)

**Fix Local Development Configuration**
- Set LOCAL_ENDORSER_API_SERVER to http://127.0.0.1:3000 (was "/api")
- Create .env.development with local API server config
- Fix ensureCorrectApiServer() method in HomeView.vue
- "Use Local" button now sets proper localhost address

**Fix Settings Cache Issues**
- Add PlatformServiceMixin to AccountViewView.vue
- Disable settings caching to prevent stale data
- Settings changes now apply immediately without browser refresh

## Impact

**Tradeoffs:**
- Lost: ~2x SharedArrayBuffer database performance
- Gained: Universal image support from any domain
- Result: Better user experience, database still fast via IndexedDB

**Files Modified:**
- Configuration: vite.config.*.mts, index.html, .env.development
- Source: constants/app.ts, libs/util.ts, views/*.vue, utils/PlatformServiceMixin.ts

## Rationale

For a community platform, universal image support is more critical than marginal
database performance gains. Users share images from arbitrary websites, making
CORS restrictions incompatible with Time Safari's core mission.

src/views/AccountViewView.vue

@@ -1029,6 +1029,7 @@ import {
 } from "../libs/util";
 import { UserProfile } from "@/libs/partnerServer";
 import { logger } from "../utils/logger";
+import { PlatformServiceMixin } from "../utils/PlatformServiceMixin";
 
 const inputImportFileNameRef = ref<Blob>();
 
@@ -1077,6 +1078,7 @@ function extractErrorMessage(error: unknown): string {
     UserNameDialog,
     DataExportSection,
   },
+  mixins: [PlatformServiceMixin],
 })
 export default class AccountViewView extends Vue {
   $notify!: (notification: NotificationIface, timeout?: number) => void;
@@ -1300,35 +1302,35 @@ export default class AccountViewView extends Vue {
 
   async toggleShowContactAmounts() {
     this.showContactGives = !this.showContactGives;
-    await databaseUtil.updateDefaultSettings({
+    await this.$saveSettings({
       showContactGivesInline: this.showContactGives,
     });
   }
 
   async toggleShowGeneralAdvanced() {
     this.showGeneralAdvanced = !this.showGeneralAdvanced;
-    await databaseUtil.updateDefaultSettings({
+    await this.$saveSettings({
       showGeneralAdvanced: this.showGeneralAdvanced,
     });
   }
 
   async toggleProdWarning() {
     this.warnIfProdServer = !this.warnIfProdServer;
-    await databaseUtil.updateDefaultSettings({
+    await this.$saveSettings({
       warnIfProdServer: this.warnIfProdServer,
     });
   }
 
   async toggleTestWarning() {
     this.warnIfTestServer = !this.warnIfTestServer;
-    await databaseUtil.updateDefaultSettings({
+    await this.$saveSettings({
       warnIfTestServer: this.warnIfTestServer,
     });
   }
 
   async toggleShowShortcutBvc() {
     this.showShortcutBvc = !this.showShortcutBvc;
-    await databaseUtil.updateDefaultSettings({
+    await this.$saveSettings({
       showShortcutBvc: this.showShortcutBvc,
     });
   }
@@ -1386,7 +1388,7 @@ export default class AccountViewView extends Vue {
         this.$refs.pushNotificationPermission as PushNotificationPermission
       ).open(DAILY_CHECK_TITLE, async (success: boolean, timeText: string) => {
         if (success) {
-          await databaseUtil.updateDefaultSettings({
+          await this.$saveSettings({
             notifyingNewActivityTime: timeText,
           });
           this.notifyingNewActivity = true;
@@ -1402,7 +1404,7 @@ export default class AccountViewView extends Vue {
           text: "", // unused, only here to satisfy type check
           callback: async (success) => {
             if (success) {
-              await databaseUtil.updateDefaultSettings({
+              await this.$saveSettings({
                 notifyingNewActivityTime: "",
               });
               this.notifyingNewActivity = false;
@@ -1446,7 +1448,7 @@ export default class AccountViewView extends Vue {
         DIRECT_PUSH_TITLE,
         async (success: boolean, timeText: string, message?: string) => {
           if (success) {
-            await databaseUtil.updateDefaultSettings({
+            await this.$saveSettings({
               notifyingReminderMessage: message,
               notifyingReminderTime: timeText,
             });
@@ -1465,7 +1467,7 @@ export default class AccountViewView extends Vue {
           text: "", // unused, only here to satisfy type check
           callback: async (success) => {
             if (success) {
-              await databaseUtil.updateDefaultSettings({
+              await this.$saveSettings({
                 notifyingReminderMessage: "",
                 notifyingReminderTime: "",
               });
@@ -1482,14 +1484,14 @@ export default class AccountViewView extends Vue {
 
   public async toggleHideRegisterPromptOnNewContact() {
     const newSetting = !this.hideRegisterPromptOnNewContact;
-    await databaseUtil.updateDefaultSettings({
+    await this.$saveSettings({
       hideRegisterPromptOnNewContact: newSetting,
     });
     this.hideRegisterPromptOnNewContact = newSetting;
   }
 
   public async updatePasskeyExpiration() {
-    await databaseUtil.updateDefaultSettings({
+    await this.$saveSettings({
       passkeyExpirationMinutes: this.passkeyExpirationMinutes,
     });
     clearPasskeyToken();
@@ -1498,7 +1500,7 @@ export default class AccountViewView extends Vue {
 
   public async turnOffNotifyingFlags() {
     // should tell the push server as well
-    await databaseUtil.updateDefaultSettings({
+    await this.$saveSettings({
       notifyingNewActivityTime: "",
       notifyingReminderMessage: "",
       notifyingReminderTime: "",