Making the charts and transitions tabs optional in the Devtools

[henri-hulski]

This adds a features object to the InitMessage when initializing the devtools, which allows to tell the devtools which features the app supports.
So for Overmind charts / transitions tabs are only shown, when the app uses overmind-statechart / state machines.

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[Copilot]

Pull Request Overview

This PR implements an optional feature flag mechanism for the DevTools to conditionally display the transitions and charts tabs based on whether the app uses state machines or state charts. Key changes include:

• Adding functions to detect state machines and state charts in the Overmind state tree.
• Extending the Overmind initialization and flush messages with a "features" object.
• Updating the DevTools client code (types, operators, UI components, and documentation) to support the new feature flags.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/overmind/src/utils.ts	Added detection utilities for state machines and state charts along with helper functions for traversing the state tree
packages/overmind/src/Overmind.ts	Included a "features" object in the initialization and flush messages to indicate supported features
packages/overmind-devtools-client/src/overmind/utils.ts	Updated default app creation to include feature flags
packages/overmind-devtools-client/src/overmind/types.ts	Extended App and InitMessage types to include optional feature flags
packages/overmind-devtools-client/src/overmind/operators.ts	Incorporated handling of feature flags during state updates with backward compatibility defaults
packages/overmind-devtools-client/src/components/Tabs/index.tsx	Modified tab rendering to conditionally show transitions and charts tabs based on feature flags
packages/overmind-devtools-client/index.html	Improved robustness with optional chaining for electron environment checks
packages/overmind-devtools-client/README.md	Updated documentation to indicate that transitions and charts tabs are optional

Comments suppressed due to low confidence (1)

packages/overmind-devtools-client/src/overmind/utils.ts:80

• Review the default values for 'features' in createApp for consistency with the Overmind init message and operators; consider adding a comment to clarify why transitions default to true here while later logic defaults to false.

features: { transitions: true, charts: true },