Unify the Slowmo toolbar, package, and extension lifecycle

[seflless]

Summary

• adds a reversible, owner-aware headless controller with side-effect-free imports
• extracts one framework-independent toolbar host shared by vanilla JS, React, the demo, and the Chrome extension
• adds slowmo/toolbar and keeps React isolated behind slowmo/react
• adds SlowmoToolbar, useSlowmoController, useSlowmoSnapshot, and useSlowmo
• rebuilds the extension as an action-triggered, per-tab session with complete close/navigation teardown
• updates the single-page landing page, local horse video, Motion demo, deep links, examples, documentation, and release instructions

Chrome extension behavior

• nothing is injected until the toolbar icon or assigned shortcut is used
• activation affects the current tab and its eligible frame tree; tabs are independent
• close removes the toolbar and restores Slowmo-owned timing effects in every injected frame
• re-triggering starts a clean session at 1×
• reload/navigation returns the document to an inactive state
• rapid activation, navigation, partial injection, Trusted Types, and stale cleanup races are guarded
• placement/orientation persist; speed and open state do not
• suggested shortcut: Command+Shift+S on macOS, Ctrl+Shift+S elsewhere; remappable in chrome://extensions/shortcuts

Package and examples

• package version: 0.17.0
• extension version: 1.4.0
• headless example: examples/headless-vanilla.js
• vanilla toolbar example: examples/toolbar-vanilla.js
• custom React controls: examples/PlaybackControls.tsx
• exact release steps: docs/RELEASING.md

Validation

• bun run typecheck
• unit: 90 passed, 1 skipped
• Chromium/Firefox/WebKit: 101 passed, 1 skipped
• real Chrome extension E2E: 9 passed
• library, demo, and extension production builds
• exact Store ZIP generated and inspected
• npm dry-run package: 30 files, React excluded from non-React entry points
• final architecture/spec review: no remaining P1/P2 findings

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Project	Deployment	Actions	Updated (UTC)
slowmo	Ready	Preview, Comment	Jul 28, 2026 7:06pm