fix: retain existing input text when selecting slash commands with optional details

electron/main.ts

@@ -1385,7 +1385,8 @@ app.whenReady().then(async () => {
     let port: number;
 
     if (isDev) {
-      port = 3000;
+      const envPort = process.env.PORT ? parseInt(process.env.PORT, 10) : NaN;
+      port = Number.isNaN(envPort) ? 3000 : envPort;
       console.log(`Dev mode: connecting to http://127.0.0.1:${port}`);
       serverPort = port;
       createWindow(`http://127.0.0.1:${port}`);

src/hooks/useSlashCommands.ts

@@ -196,9 +196,15 @@ export function useSlashCommands(opts: {
         // Block during streaming — badges dispatch as slash/skill prompts, not queueable
         if (isStreaming) { closePopover(); return; }
         setBadge(result.badge!);
-        setInputValue('');
+        setInputValue(result.newInputValue ?? '');
         closePopover();
-        setTimeout(() => textareaRef.current?.focus(), 0);
+        setTimeout(() => {
+          const el = textareaRef.current;
+          if (!el) return;
+          el.focus();
+          const pos = el.value.length;
+          el.setSelectionRange(pos, pos);
+        }, 0);
         return;
 
       case 'insert_file_mention':

src/lib/message-input-logic.ts

@@ -84,6 +84,21 @@ export function filterItems(items: PopoverItem[], filter: string): PopoverItem[]
   );
 }
 
+/**
+ * Splits input text around a popover trigger, removing the trigger character
+ * and any filter text that was typed after it.
+ */
+function splitAroundTrigger(
+  inputValue: string,
+  triggerPos: number,
+  popoverFilter: string,
+): { before: string; after: string } {
+  const before = inputValue.slice(0, triggerPos);
+  const cursorEnd = triggerPos + popoverFilter.length + 1; // +1 to consume the trigger character
+  const after = inputValue.slice(cursorEnd);
+  return { before, after };
+}
+
 /**
  * Determines what happens when an item is selected from the popover.
  * Used by insertItem in useSlashCommands.
@@ -100,8 +115,9 @@ export function resolveItemSelection(
     return { action: 'immediate_command', commandValue: item.value };
   }
 
-  // Non-immediate commands: show as badge
+  // Non-immediate commands: show as badge, preserving any text outside the trigger
   if (popoverMode === 'skill') {
+    const { before, after } = splitAroundTrigger(inputValue, triggerPos, popoverFilter);
     return {
       action: 'set_badge',
       badge: {
@@ -111,13 +127,12 @@ export function resolveItemSelection(
         kind: item.kind || 'slash_command',
         installedSource: item.installedSource,
       },
+      newInputValue: before + after,
     };
   }
 
   // File mention: insert into text
-  const before = inputValue.slice(0, triggerPos);
-  const cursorEnd = triggerPos + popoverFilter.length + 1;
-  const after = inputValue.slice(cursorEnd);
+  const { before, after } = splitAroundTrigger(inputValue, triggerPos, popoverFilter);
   const insertText = `@${item.value} `;
   return {
     action: 'insert_file_mention',