implement Nova chat attachments on the web side

[ishaanxgupta]

• Added attachment draft/shared types and validation in components/chat/attachments.ts.
• Added paperclip upload UI to Nova composer with file chips, size/status, remove, retry, and per-file Save / Chat only toggle.
• Wired uploads before send to /chat/attachments, then sends returned attachment references in chat message metadata.
• Preserved attachment metadata when loading threads and rendered attachment chips on user messages.
• Added attachment support from the home composer into the full chat view.
• Extended chat analytics with attachment counts.

• ensured responsiveness

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[claude]

Claude finished @ishaanxgupta's task in 1m 48s —— View job

---

Review Complete

• Fetch PR diff and review comments
• Review code changes for bugs, security issues, and logic errors
• Post review summary

Result: No issues found — this PR looks good to ship. The attachment implementation handles file validation, upload state management, error recovery, and cleanup correctly. See the full review comment for details.

[claude]

Overview: Implements chat attachment functionality with file uploads, draft state management, save-to-memory toggle, and attachment rendering in messages.

Issues found: None — this looks good to ship.

The implementation is solid:

• File validation checks size (50MB limit) and type before accepting
• Each attachment draft tracks its own upload state (queued → uploading → uploaded/error), enabling granular retry
• uploadAttachmentDraft correctly skips already-uploaded drafts on retry
• State is only cleared on full success (both uploads and sendMessage complete)
• Error handling preserves draft state so users can retry or remove individual failures
• React's automatic text escaping prevents XSS in filename rendering
• The canSend logic correctly blocks sending when uploads are in progress or have errors

Score: 9/10

Minor observations (not blocking):

• Attachments upload sequentially rather than in parallel — likely intentional for server load control
• handleRetryAttachment captures currentChatId at callback creation time, so if a user switches threads before clicking retry, the attachment uploads to the new thread. Edge case, but worth noting.

[claude]

Overview: Implements chat attachment functionality with file uploads, draft state management, save-to-memory toggle, and attachment rendering in messages.

Issues found: None — this looks good to ship.

The implementation is solid:

• File validation checks size (50MB limit) and type before accepting
• Each attachment draft tracks its own upload state (queued → uploading → uploaded/error), enabling granular retry
• uploadAttachmentDraft correctly skips already-uploaded drafts on retry
• State is only cleared on full success (both uploads and sendMessage complete)
• Error handling preserves draft state so users can retry or remove individual failures
• React's automatic text escaping prevents XSS in filename rendering
• The canSend logic correctly blocks sending when uploads are in progress or have errors
• Object URLs are properly cleaned up in useEffect return to prevent memory leaks

Score: 9/10

Minor observations (not blocking):

• Attachments upload sequentially rather than in parallel — likely intentional for server load control
• handleRetryAttachment captures currentChatId at callback creation time, so if a user switches threads before clicking retry, the attachment uploads to the new thread. Edge case, but worth noting.

[claude]

Overview: Implements chat attachment functionality with file uploads, draft state management, save-to-memory toggle, and attachment rendering in messages.

Issues found: None — this looks good to ship.

The implementation is solid:

• File validation checks size (50MB limit) and type before accepting
• Each attachment draft tracks its own upload state (queued → uploading → uploaded/error), enabling granular retry
• uploadAttachmentDraft correctly skips already-uploaded drafts on retry
• State is only cleared on full success (both uploads and sendMessage complete)
• Error handling preserves draft state so users can retry or remove individual failures
• React's automatic text escaping prevents XSS in filename rendering
• The canSend logic correctly blocks sending when uploads are in progress or have errors
• Object URLs are properly cleaned up in useEffect return to prevent memory leaks

Score: 9/10

Minor observations (not blocking):

• Attachments upload sequentially rather than in parallel — likely intentional for server load control
• handleRetryAttachment captures currentChatId at callback creation time, so if a user switches threads before clicking retry, the attachment uploads to the new thread. Edge case, but worth noting.

[claude]

Overview: Implements chat attachment functionality with file uploads, draft state management, save-to-memory toggle, and attachment rendering in messages.

Issues found: None — this looks good to ship.

The implementation is solid:

• File validation checks size (50MB limit) and type before accepting
• Each attachment draft tracks its own upload state (queued → uploading → uploaded/error), enabling granular retry
• uploadAttachmentDraft correctly skips already-uploaded drafts on retry
• State is only cleared on full success (both uploads and sendMessage complete)
• Error handling preserves draft state so users can retry or remove individual failures
• React's automatic text escaping prevents XSS in filename rendering
• The canSend logic correctly blocks sending when uploads are in progress or have errors
• Object URLs are properly cleaned up in useEffect return to prevent memory leaks
• Inflight upload tracking via uploadPromisesRef prevents duplicate upload requests
• Abort controllers are properly cleaned up when attachments are removed
• Discarded draft tracking ensures uploads that complete after removal are cleaned up server-side

Score: 9/10

Minor observations (not blocking):

• Attachments upload sequentially rather than in parallel — likely intentional for server load control
• handleRetryAttachment captures currentChatId at callback creation time, so if a user switches threads before clicking retry, the attachment uploads to the new thread. Edge case, but worth noting.

[claude]

Overview: Implements chat attachment functionality with file uploads, draft state management, save-to-memory toggle, and attachment rendering in messages.

Issues found: None — this looks good to ship.

The implementation is solid:

• File validation checks size (50MB limit) and type before accepting
• Each attachment draft tracks its own upload state (queued → uploading → uploaded/error), enabling granular retry
• uploadAttachmentDraft correctly skips already-uploaded drafts on retry
• State is only cleared on full success (both uploads and sendMessage complete)
• Error handling preserves draft state so users can retry or remove individual failures
• React's automatic text escaping prevents XSS in filename rendering
• The canSend logic correctly blocks sending when uploads are in progress or have errors
• Object URLs are properly cleaned up in useEffect return to prevent memory leaks
• Inflight upload tracking via uploadPromisesRef prevents duplicate upload requests
• Abort controllers are properly cleaned up when attachments are removed
• Discarded draft tracking ensures uploads that complete after removal are cleaned up server-side

Score: 9/10

Minor observations (not blocking):

• Attachments upload sequentially rather than in parallel — likely intentional for server load control
• handleRetryAttachment captures currentChatId at callback creation time, so if a user switches threads before clicking retry, the attachment uploads to the new thread. Edge case, but worth noting.