Add some file-related events to let users know about a file having been opened, closed, etc.

[agarny]

Fixes #491.

[Copilot]

Pull request overview

Adds file lifecycle events to the OpenCOR Vue component API so consumers can react to files being opened/closed (and to open failures), alongside some related event-payload refactoring and version/dependency bumps.

Changes:

• Emit fileOpened/fileClosed from ContentsComponent and forward them as a public file event from OpenCOR.vue (plus emit file issue events on open failures).
• Refactor externalData and simulationData event payloads into discriminated unions with a type field; update example apps accordingly.
• Bump package versions and update postcss (and lockfiles).

Reviewed changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/renderer/src/components/views/SimulationExperimentView.vue	Returns typed externalData/simulationData result events (added/updated vs issue).
src/renderer/src/components/OpenCOR.vue	Wires fileOpened/fileClosed into a new public file event; emits file issue events from processFile failures; updates issue payloads for other events.
src/renderer/src/components/ContentsComponent.vue	Adds and emits fileOpened/fileClosed component events; updates returned event payloads to include type.
src/renderer/src/AppWithSimulationData.vue	Updates example handler to switch on event.type.
src/renderer/src/AppWithExternalData.vue	Updates example handler to switch on event.type.
src/renderer/package.json	Bumps renderer package version and postcss.
src/renderer/index.ts	Adds new file event type and refactors event payload types into discriminated unions.
src/renderer/bun.lock	Lockfile updates for renderer dependency bump(s).
package.json	Bumps root package version and postcss.
bun.lock	Root lockfile updates for dependency bump(s).

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