Keep single Save button, Show next sync, default to prod Khoj URL in …

…Desktop app

- Make mutable syncing variable not a const
- Show next sync time to make users aware of data sync is automated
- Keep a single Save button to reduce confusion. It does what Save All
  previously did. Intent to manual sync should Save All
- Default to using app.khoj.dev as default Khoj URL to ease setup

src/interface/desktop/config.html

@@ -91,10 +91,7 @@ <h3 class="card-title">
             </div>
             <div class="section-action-row">
                 <div class="card-description-row">
-                    <button id="sync-data" class="sync-data">💾 Save</button>
-                </div>
-                <div class="card-description-row">
-                    <button id="sync-force" class="sync-data">💾 Save All</button>
+                    <button id="sync-force" class="sync-data">💾 Save</button>
                 </div>
                 <div class="card-description-row">
                     <button id="delete-all" class="sync-data">🗑️ Delete All</button>

src/interface/desktop/main.js

@@ -10,7 +10,7 @@ const {dialog} = require('electron');
 const cron = require('cron').CronJob;
 const axios = require('axios');
 
-const KHOJ_URL = 'http://127.0.0.1:42110'
+const KHOJ_URL = 'https://app.khoj.dev';
 
 const Store = require('electron-store');
 
@@ -67,7 +67,7 @@ const schema = {
     }
 };
 
-const syncing = false;
+let syncing = false;
 var state = {}
 const store = new Store({ schema });
 

src/interface/desktop/renderer.js

@@ -155,11 +155,14 @@ window.updateStateAPI.onUpdateState((event, state) => {
     loadingBar.style.display = 'none';
     let syncStatusElement = document.getElementById("sync-status");
     const currentTime = new Date();
+    nextSyncTime = new Date();
+    nextSyncTime.setMinutes(Math.ceil((nextSyncTime.getMinutes() + 1) / 10) * 10);
     if (state.completed == false) {
         syncStatusElement.innerHTML = `Sync was unsuccessful at ${currentTime.toLocaleTimeString()}. Contact team@khoj.dev to report this issue.`;
         return;
     }
-    syncStatusElement.innerHTML = `Last synced at ${currentTime.toLocaleTimeString()}`;
+    const options = { hour: '2-digit', minute: '2-digit' };
+    syncStatusElement.innerHTML = `⏱️ Synced at ${currentTime.toLocaleTimeString(undefined, options)}. Next sync at ${nextSyncTime.toLocaleTimeString(undefined, options)}.`;
 });
 
 const urlInput = document.getElementById('khoj-host-url');