fix(chat): only treat a period as a mention boundary when no name continues after it

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/home/components/user-message-content/utils.test.ts

@@ -17,6 +17,11 @@ describe('computeMentionRanges', () => {
     expect(spans('(see @Workflow)', [workflow])).toEqual(['@Workflow'])
   })
 
+  it('treats a period as a boundary only when no name continues after it', () => {
+    expect(spans('see @Workflow.', [workflow])).toEqual(['@Workflow'])
+    expect(spans('open @report.pdf', [{ kind: 'file', label: 'report' }])).toEqual([])
+  })
+
   it('matches every repeat of a mention separated by one space', () => {
     expect(spans('@Workflow @Workflow', [workflow])).toEqual(['@Workflow', '@Workflow'])
   })

apps/sim/app/workspace/[workspaceId]/home/components/user-message-content/utils.ts

@@ -31,7 +31,10 @@ export function computeMentionRanges(text: string, contexts: ChatMessageContext[
     const prefix =
       ctx.kind === 'skill' || ctx.kind === 'mcp' || ctx.kind === 'slash_command' ? '/' : '@'
     const token = `${prefix}${ctx.label}`
-    const pattern = new RegExp(`(^|\\s)(${escapeRegExp(token)})(?=[\\s.,;:!?)\\]]|$)`, 'g')
+    const pattern = new RegExp(
+      `(^|\\s)(${escapeRegExp(token)})(?=[\\s,;:!?)\\]]|\\.(?![\\w-])|$)`,
+      'g'
+    )
     let match: RegExpExecArray | null
     while ((match = pattern.exec(text)) !== null) {
       const leadingSpace = match[1]