[maartenbreddels]

Lets apps pass dependencies= to define_module on the Solara server, as ipyvue and ipyreact now allow.

Problem

ipyvue (#106, #108) and ipyreact are getting a dependencies= argument on define_module, so an app can say which modules a module waits for.
Solara replaces both libraries' define_module on its server with kernel-aware versions, and those versions have no dependencies= argument.
So app code that passes it works in Jupyter but raises TypeError when the same app runs on Solara.

Change

• solara/server/esm.py (ipyreact) and solara/server/esm_vue.py (ipyvue): define_module takes dependencies: Optional[List[str]] = None.
• Without it, nothing changes: a new name waits for every earlier name, and a redefinition keeps its first list.
• With it, the explicit list replaces the stored list, on the first definition and on a redefinition.
• esm_vue.create_modules now also updates dependencies on a live url-backed widget. Before, only code and path modules got the update, so an explicit list on a url module never reached the browser.

Validation

• tests/unit/esm_test.py and tests/unit/esm_vue_test.py gained test_define_module_dependencies: explicit list, default, redefinition without a list, redefinition with a list, and (Vue) a redefined url module. 20 tests passed locally.
• The ipyvue tests ran against an ipyvue checkout with define_module, because the released ipyvue 3.0.0 does not have it yet.

Gaps

• Released ipyvue has no define_module yet, so esm_vue_test.py skips in CI until ipyvue #106 is released.

Align results

Caution

/align was not run on this change: the interface (ipyreact parity, explicit dependencies= overrides the default) was settled with the maintainer in the ipyvue review session.

Crossreview results

• Rounds: 1. Reviewers: astra and sol, on d3f4909. Both APPROVE with no findings.
• No CRITICAL or HIGH finding.
• Neither reviewer could run the tests in its read-only sandbox; the worker ran them locally (20 passed).
• Small fixes: none.

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