feat: add sidebar filter telemetry for change detection

[valentinpalkovic]

Summary

• Adds a sidebar-filter telemetry event that tracks when users toggle built-in tag filters (_docs, _play, _test) or change detection status filters (new, modified, affected)
• Tracks filter usage from both UI interactions and URL-hydrated filters (shared links/bookmarks)
• Includes per-filter story counts in the payload so we can understand filter usage in context of project size
• User-defined tag filters are explicitly excluded from telemetry

Changes

• core-events/index.ts: Add SIDEBAR_FILTER_CHANGED channel event constant
• telemetry/types.ts: Add 'sidebar-filter' to EventType union
• telemetry-channel.ts: Handle SIDEBAR_FILTER_CHANGED and forward to telemetry backend
• FilterPanel.tsx: Emit telemetry on built-in tag and status filter interactions
• stories.ts: Emit telemetry on page load when filters are pre-set via URL params

Test plan

• Added tests for telemetry channel handler (forwards payload, respects disableTelemetry)
• Manual: Toggle status filters in sidebar → verify telemetry event emitted
• Manual: Visit Storybook with ?statuses=new URL param → verify URL-trigger telemetry event
• Manual: Toggle user-defined tag filter → verify no telemetry emitted

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com

Summary by CodeRabbit

• New Features
  • Added comprehensive sidebar filter telemetry tracking
  • Captures details on active tag filters and status filters when modified through the UI or via URL parameters
  • Records story counts associated with each filter state change
  • Enables better understanding of user filtering behavior through analytics

[github-actions]

	Fails
🚫	PR is not labeled with one of: ["cleanup","BREAKING CHANGE","feature request","bug","documentation","maintenance","build","dependencies"]
🚫	PR is not labeled with one of: ["ci:normal","ci:merged","ci:daily","ci:docs"]
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🚫	PR description is missing the mandatory "#### Manual testing" section. Please add it so that reviewers know how to manually test your changes.

Generated by 🚫 dangerJS against e3a4746

[coderabbitai]

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Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: d8665027-e3b3-4553-94e3-b418b340f85d

📥 Commits

Reviewing files that changed from the base of the PR and between 7cb708b and e3a4746.

📒 Files selected for processing (6)

• code/core/src/core-events/index.ts
• code/core/src/core-server/server-channel/telemetry-channel.test.ts
• code/core/src/core-server/server-channel/telemetry-channel.ts
• code/core/src/manager-api/modules/stories.ts
• code/core/src/manager/components/sidebar/FilterPanel.tsx
• code/core/src/telemetry/types.ts

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📝 Walkthrough

Walkthrough

This PR introduces telemetry tracking for sidebar filter changes. It adds a new SIDEBAR_FILTER_CHANGED event constant, extends the telemetry type system to support 'sidebar-filter' events, registers a telemetry channel listener, and emits the event when filters are applied via URL parameters or user interactions.

Changes

Cohort / File(s)	Summary
Event Definition & Telemetry Types code/core/src/core-events/index.ts, code/core/src/telemetry/types.ts	Added SIDEBAR_FILTER_CHANGED event constant and extended EventType union to include 'sidebar-filter' event type.
Telemetry Channel Handling code/core/src/core-server/server-channel/telemetry-channel.ts, code/core/src/core-server/server-channel/telemetry-channel.test.ts	Registered listener for SIDEBAR_FILTER_CHANGED event that forwards payloads to telemetry service; added test cases covering both enabled and disabled telemetry scenarios.
Event Emission code/core/src/manager-api/modules/stories.ts, code/core/src/manager/components/sidebar/FilterPanel.tsx	Added event emission on filter interactions: stories.ts emits when URL-derived filters are applied with computed story counts; FilterPanel.tsx emits on user-triggered filter changes (tag and status filter toggles/inversions) with active filter details.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

Possibly related PRs

• Telemetry: Fix preview-first-load event #32859: Modifies telemetry types and server-channel telemetry logic that this PR builds upon for the new sidebar-filter event type.
• Core: Add preview-first-load telemetry #32770: Also adds a new core event and wires telemetry for it by updating core-events exports and extending telemetry type definitions.
• Telemetry: Add share events #33766: Adds new telemetry events with corresponding channel listeners; modifies the same core-events, telemetry/types, and telemetry registration files.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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