Audit fixes: memory leaks, perf, dialog/backend consolidation#287

Merged

milanofthe merged 16 commits intomainfrom

chore/audit-fixes

May 9, 2026

Commits on May 9, 2026

fix: clean up recordingData subscriptions in BlockPropertiesDialog
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fix: clean up registry/path subscriptions in EventsPanel
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fix: clean up registry subscription in NodeLibrary
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fix: clean up toolboxes subscription in ToolboxManagerDialog
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fix: clean up subsystemTree subscription in +page.svelte
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perf: append in place in mergeStreamingResult to avoid quadratic reallocation
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perf: replace JSON.stringify diff with shallow-equal helpers in FlowCanvas
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perf: replace JSON.parse(JSON.stringify(...)) with structuredClone
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refactor: extract createHoverDetail action shared by NodeLibrary and EventsPanel
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refactor: extract DialogShell and migrate ConfirmationModal, KeyboardShortcuts, Export, CodePreview, SearchDialog
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refactor: migrate remaining dialogs (PlotOptions, EventProperties, BlockProperties, ToolboxManager) to DialogShell
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refactor: extract AbstractBackend base class for state and callback plumbing
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perf: lazy-load and async-decode WelcomeModal example screenshots
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perf: cap inlineMath render cache at 500 entries with LRU eviction
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refactor: consolidate routing/dimension magic constants into routing/constants and dimensions
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refactor: extract applyWaypointUpdate helper to deduplicate routing waypoint methods
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