TemplateChip DOM portal needs fallback when CopilotKit textarea DOM changes

[GeneralJerel]

Problem

TemplateChip (template-chip.tsx:29-46) injects itself into CopilotKit's internal DOM by querying [data-testid="copilot-chat-textarea"] and walking to parentElement to insert a portal container. If CopilotKit changes the textarea's DOM nesting in a future update, the chip silently disappears with no indication to the user.

Same fragility exists in template-library/index.tsx:69 which uses the same selector to focus the textarea after applying a template.

Suggested fix

• Add a fallback: if the portal target isn't found, render the chip above the chat area (e.g. as a fixed-position element) instead of rendering nothing
• Add a prominent comment documenting the CopilotKit DOM coupling so it's caught during upgrades
• Consider checking if CopilotKit exposes a stable API for injecting content near the input area

Files

• apps/app/src/components/template-library/template-chip.tsx
• apps/app/src/components/template-library/index.tsx

From PR #20 review