Add Sheet Playground sample

[hthau]

What I Did:

• Added a new Sheet Playground LWC sample demonstrating how to embed and interact with the <msmx-sheet-sheet> component directly from a custom Lightning Web Component.

• Added a new Sheet Playground tab to the Sheet Integration Example app.

• Updated the sample permission set to grant access to the new Sheet Playground tab.

• Updated both README and README_ja with:

  • Usage instructions for the Sheet Playground sample.
  • Technical highlights covering component embedding, property binding, event handling, and manual application patterns.
  • Screenshots illustrating the Sheet Playground UI and behavior.

Note:

• The sample is currently using an older package version. Due to a known limitation, changes to the book-id and sheet-id properties are not reflected when these values are updated dynamically after the component has been initialized.
• Once a package version that includes support for dynamic book-id / sheet-id updates becomes available, the sample and documentation should be revisited and updated accordingly.

[stomita]

<msmxsheet-sheet-component>

[hthau]

Fixed in 44035bf

[stomita]

<msmxsheet-sheet-component>

[hthau]

Fixed in 44035bf

[stomita]

The component id would not be changed (and developer should not change it) during the component lifecycle.

[hthau]

Fixed in 44035bf

[stomita]

@hthau

Doc/attribute name mismatch: README says context-record-id, component attribute is record-id

In README.md (line 166) and README_ja.md (line 169), the Property Binding section lists context-record-id, but msmxSheet's sheetComponent exposes the record context through the record-id attribute (@api recordId) — there is no context-record-id attribute.

The sample markup itself is correct: force-app/main/default/lwc/sheetPlayground/sheetPlayground.html (line 187) uses record-id={applied.contextRecordId}. Only the READMEs use the non-existent context-record-id name (the binding source variable is contextRecordId, which looks like where the mix-up came from).

Please update both READMEs to use record-id so the documented attribute names match the actual component API.

[msmx-mnakagawa]

Findings from exercising the Sheet Playground sample:

1. Permission set lacks Apex class access for SheetPlaygroundController — with only the README-prescribed permission sets, a non-admin user gets a "no access to Apex class" error on getBooks, leaving the Book picker empty. Adding the class access to Mashmatrix_Sheet_Integration_Examples (plus sharing a book to the user) makes the playground fully functional (verified). Consider also noting in the README that books must be shared to the testing user, since the controller is with sharing.

2. Fixed componentId breaks multi-instance placement — every instance mounts with component-id="sheet-integration-example" and the field is not editable. Placing two playgrounds on one page makes them interfere with each other (applying Book/Sheet on one switches the other's display; reproduced). Each instance needs a distinct component-id; suggest a per-instance design-time id (e.g. an App Builder property or a generated unique default) plus a README note that a unique component-id per instance is required.

3. Auto-selecting the first book overrides the host's intent — wiredBooks falls back to bookOptions[0] and applies it, so the playground displays a book the host never requested and the sample never exercises the empty book-id state. Suggest dropping the auto-select (or making it opt-in) so the sample reflects only what the user explicitly sets.

4. README install package needs updating for this sample — with the package id currently referenced in the setup steps, the playground's book/sheet switching does not work as demonstrated. The package id in both README.md and README_ja.md should be updated to one that this sample actually works against before release.

Everything else checked out: markup/attribute names in both READMEs match the component API, and the sample demonstrates record-selection events, parameter changes, context-record switching, and book/sheet switching.