feat(ph-ai): notebook artifacts UI

[kappa90]

Problem

New NotebookArtifactAnswer to support in-chat Notebooks, and conversion of those to TipTap notebooks.

Changes

• Added new block types to the schema:
  • LoadingBlock: Displays loading state for artifacts being processed
  • ErrorBlock: Shows error messages when artifacts fail to load
• Updated VisualizationBlock to directly contain query data instead of referencing by ID
• Created a new NotebookArtifactAnswer component to render notebook artifacts in Max
• Added utility function markdownToTiptap to convert markdown to Tiptap format for notebook creation
• Added storybook examples for different notebook artifact scenarios
• Improved streaming message handling in maxThreadLogic with finalizeStreamingMessages action (rationale: with notebooks, we might have more than one streaming message at once, so we need to clean failed streamed messages when restarting the conversation, adding a temp id, so they don't get mistakenly replaced by new streaming content)

How did you test this code?

Stories + tests + locally (needs the next PR in the stack to run)

[kappa90]

• #42909 : 2 dependent PRs (#43062 , #43070 )
• #42697
• #42696 👈 (View in Graphite)
• #42060
• #42052 : 1 other dependent PR (#42704 )
• #42888
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.

[wiz-7ad640923b[bot]]

Wiz Scan Summary

⚠️ Many findings detected

Many findings were detected, but only a subset of the findings are displayed inline due to API constraints. To view all findings inline, please click here.

Scanner	Findings
Vulnerabilities	22  22  13
Sensitive Data	1
Secrets	-
IaC Misconfigurations	-
SAST Findings	-
Software Supply Chain Findings	-
Total	22  22  13  1

View scan details in Wiz

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[kappa90]

Edits:

• Moved to tiptap 3.11.x with Markdown support, removed custom markdown to json conversion

[github-actions[bot]]

Size Change: +25.9 kB (+0.68%)

Total Size: 3.81 MB

Filename	Size	Change
frontend/dist/toolbar.js	3.81 MB	+25.9 kB (+0.68%)

_{compressed-size-action}

[posthog-bot]

Visual regression: Storybook UI snapshots updated

Changes: 14 snapshots (6 modified, 8 added, 0 deleted)

What this means:

• Snapshots have been automatically updated to match current rendering
• Next CI run will switch to CHECK mode to verify stability
• If snapshots change again, CHECK mode will fail (indicates flapping)

Next steps:

• Review the changes to ensure they're intentional
• Approve if changes match your expectations
• If unexpected, investigate component rendering

Review snapshot changes →

[posthog-bot]

Visual regression: Storybook UI snapshots updated

Changes: 6 snapshots (6 modified, 0 added, 0 deleted)

What this means:

• Snapshots have been automatically updated to match current rendering
• Next CI run will switch to CHECK mode to verify stability
• If snapshots change again, CHECK mode will fail (indicates flapping)

Next steps:

• Review the changes to ensure they're intentional
• Approve if changes match your expectations
• If unexpected, investigate component rendering

Review snapshot changes →

[posthog-bot]

Visual regression: Storybook UI snapshots updated

Changes: 2 snapshots (2 modified, 0 added, 0 deleted)

What this means:

• Snapshots have been automatically updated to match current rendering
• Next CI run will switch to CHECK mode to verify stability
• If snapshots change again, CHECK mode will fail (indicates flapping)

Next steps:

• Review the changes to ensure they're intentional
• Approve if changes match your expectations
• If unexpected, investigate component rendering

Review snapshot changes →

[graphite-app[bot]]

Merge activity

• Dec 17, 10:23 AM UTC: This pull request can not be added to the Graphite merge queue. Please try rebasing and resubmitting to merge when ready.
• Dec 17, 10:23 AM UTC: Graphite disabled "merge when ready" on this PR due to: a merge conflict with the target branch; resolve the conflict and try again..
• Dec 17, 6:10 PM UTC: @kappa90 merged this pull request with Graphite.

[posthog-bot]

Visual regression: Storybook UI snapshots updated

Changes: 12 snapshots (12 modified, 0 added, 0 deleted)

What this means:

• Snapshots have been automatically updated to match current rendering
• Next CI run will switch to CHECK mode to verify stability
• If snapshots change again, CHECK mode will fail (indicates flapping)

Next steps:

• Review the changes to ensure they're intentional
• Approve if changes match your expectations
• If unexpected, investigate component rendering

Review snapshot changes →

[posthog-bot]

⏭️ Skipped snapshot commit because branch advanced to 3360c97 while workflow was testing 10660b7.

The new commit will trigger its own snapshot update workflow.

If you expected this workflow to succeed: This can happen due to concurrent commits. To get a fresh workflow run, either:

• Merge master into your branch, or
• Push an empty commit: git commit --allow-empty -m 'trigger CI' && git push

[posthog-bot]

Query snapshots: Backend query snapshots updated

Changes: 1 snapshots (1 modified, 0 added, 0 deleted)

What this means:

• Query snapshots have been automatically updated to match current output
• These changes reflect modifications to database queries or schema

Next steps:

• Review the query changes to ensure they're intentional
• If unexpected, investigate what caused the query to change

Review snapshot changes →