4.0.0 (2026-06-06)

Bug Fixes

• accessibility: add descriptive alt text (8e16302)
• add Angular 20 compatibility by upgrading dependencies and migrating to application builder (a1bccdc), closes #728
• add missing ngOnDestroy cleanup in 4 UI components (bb2278b), closes #865
• add unsubscribe mechanism to prevent callback memory leaks (9c10385)
• align screenshot mode button styling (40bf07b)
• app: fixing tests (9402d2f)
• app: isolate Jest and Cypress TypeScript types to restore IntelliSense (4eee288)
• apply lint formatting fixes (183294c)
• clean up event listeners in OverlayComponent and SSModeComponent (54ba286), closes #762
• clear selections before track extension to prevent stale outlines (594e3e8)
• convert makeRequest() to async/await with proper error propagation (8b770da), closes #847
• correct stretch rendering logic, remove crop offsets, proper viewOffset and aspect handling (1b836b3)
• correct Stretch screenshot aspect ratio & restore camera aspect (5a1662c)
• correct viewOffset typing to resolve TS2349 error (07e9fc1)
• deduplicate three.js instance bundled by jsroot (8e13cbc), closes #655
• dispose intermediate geometries after merging (ad79b44)
• dispose WebGL renderers and revoke blob URLs to prevent resource leaks (a59b067), closes #845
• dispose WebGL resources and event listeners on cleanup (b7cd200)
• effects-manager: sync selection outlines with object transforms (cf02404)
• event-display: a patch to a typo (90db004)
• exclude generated docs from ESLint to fix release build (ca4c63b)
• gltf: dispose intermediate geometries after merge (c50d18b)
• hide eta-phi panel button on LHCb section (4f0c25c)
• hide labels during animations until event objects fully appear (efd4e3e)
• ignore generated docs in eslint (c0dc65f)
• import-manager: dispose intermediate geometries after GLTF merge (2d4fb93)
• initialize callback functions + update Docker install step to fix CI (4a6d799)
• initialize callbacks + update Dockerfile base image to fix CI (e86b35d)
• io-options-dialog: add try/catch for JSON parse errors with user feedback (#842) (d77601f)
• jivexml: prevent crash on missing XML tags in vertex parsing (2752bb8)
• make-picture: remove outdated size check for tiled screenshots (6d7a5f0)
• phoenix-objects: guard against undefined track.pos (35d496f)
• preserve main renderer during cleanup to prevent disposed-renderer reuse (4cdb72a)
• python install and node-gyp python3 path for CI (82e5612)
• re-apply collection cuts after event switch and clear registry on rebuild (4683c91)
• release: add OIDC permissions, pin action versions, fix exports warnings (44dd281), closes #851
• release: use actual release version for Docker tags (4e4c7b8)
• remove checkSize and disabled logic as requested (c9ee693)
• remove unsupported --verbose flag from yarn install (56317f2)
• rename RendererManager.removeControls() to removeRenderer() (#809) (66a7762)
• renderer-manager: swap renderers in class state instead of local params (9409909), closes #808
• replace cypress-plugin-snapshots with @frsource/cypress-plugin-visual-regression-diff (10b296a), closes #733
• replace deprecated substr() with substring() in url-options-manager\n\nReplace window.location.href.substr() with substring() and add a guard\nfor missing query string to prevent incorrect behavior when the URL\nhas no '?' character." (ddbd110)
• replace hardcoded column exclusion list with configurable Input (c693972)
• reset callbacks and state on view transitions (0c12096)
• resolve Dockerfile conflict and enable native build for lmdb (247b909)
• resolve duplicate AttributePipe and stabilize Angular 20 tests (3646a9f)
• restore callback typings + initialize defaults + replace python with python3 in Dockerfile (0c41d48)
• restore crop/stretch logic + integrate tiling safely (cc8b764)
• restore default UI config for LHCb (f4b4b4e)
• restore stretch aspect logic + safe TS guards (5eddf2d)
• revert rainbow selection to amber glow, improve jet and selection UX (#839) (0f6da97)
• safe camera view offset calls (e06a9c2)
• scene-manager: dispose GPU resources on event switch (ae6df4a)
• selection-manager: prevent duplicate event listeners on re-init (cb9daec)
• stabilize Jest tests for Angular 20 compatibility (3270baf)
• test: make setup-jest ESLint-safe for Angular 20 (504a131)
• three-manager: clear selections on event switch to prevent memory leak (1335d57)
• three-manager: complete event listener cleanup on re-init (a72f27b)
• ui: clear cycle-events interval on component destroy (8b650d5)
• ui: handle FileReader errors in IO options dialog (005e6d1)
• upgrade tween.js to v25 with explicit group management (acec46c), closes #680
• upgrade TypeScript to 5.7 with Jest ESM mocks (7969ece)
• use Angular build configs for deploy scripts to avoid outputPath override (5d5a986)
• use distinct icon for collections info panel (7cbb895)
• use InstancedMesh for CaloCells to prevent WebGL crash (#474) Signed-off-by: rx18-eng remopanda78@gmail.com (766d3ba)

Features

• add eta-phi energy map panel (012fb8d)
• add event dataset browser with physics-aware filtering (#861) (28a8995)
• add EventAutoloader for live event streaming from directories/endpoints (4b3f139)
• add masterclass panel and ATLAS masterclass landing page (closes #835, closes #915) (8a6784c)
• add per-collection track extension to radius (#177) (2983295)
• add PHYSLITE ROOT file loader for ATLAS Open Data (#823) (d9ff993)
• add tiled screenshot rendering to support very large images (#581) (67d522d)
• add track kinematics panel with config-driven columns (846edca)
• add typed event data pipeline with loader registry (901707a)
• add URL deep linking with full view state sharing (4124325)
• add URL event loading with auto-refresh clean-branch(#448) (1b95c31)
• effects-manager: add EffectsState enum and setHoverColor() (#886) (eabcdbf)
• event-display: implement performant rainbow selection system with multi-object support (bfa2705)
• event-display: implement rainbow outline selection system with EdgesGeometry (6bb0256)
• event-display: migrate to controls-based architecture with dual canvas support (b045001)
• make UI components configurable via UIMenuConfig (#61) (09efeb8)
• merge screenshot mode into make picture menu (#540) (0edb178)
• notification-service: add NotificationService with 4 severity levels (#886) (067155a)
• offload JiveXML/JSON parsing to Web Worker to prevent UI freeze (f101fb3)
• state-manager: serialize cut state to JSON and restore via Load State (092814b), closes #872 #863
• support per-track linewidth in TracksMesh (4c7d711)

Performance Improvements

• phoenix-ng: isolate animation loop outside NgZone (b8e1f98), closes HSF/phoenix#827

Reverts

• Revert "chore: apply prettier and eslint fixes" (8904c1c)