fix: sync every storage var that shares a name across tabs

[flcrom]

Closes #7506.

Builds on #7544. The first commit in this branch is that PR's commit (9870bf1), because the new test uses the react override that #7544 adds to the state_js.test.mjs setup. Only the second commit (40bfe59) is new here. I'll rebase onto main once #7544 merges, or happy to restructure if you prefer.

When several sync=True storage vars share one storage name, a write in another tab updated only one of them (the last declared), so the others stayed stale until a reload. The common case is a named synced field on an rx.ComponentState used more than once. The cross-tab sync now updates every var that shares the name.

Added tests to state_js.test.mjs for the shared-name case. node --experimental-vm-modules --test tests/units/compiler/state_js.test.mjs passes locally, 21/21. I did not run the full test suite or lint locally; CI will.

News fragment included.

All Submissions:

• Have you followed the guidelines stated in CONTRIBUTING.md file?
• Have you checked to ensure there aren't any other open Pull Requests for the desired changed?

Type of change

• Bug fix (non-breaking change which fixes an issue)

[cubic-dev-ai]

No issues found across 4 files

_{View guided diff | Re-trigger cubic}

[greptile-apps]

Confidence Score: 5/5

[Medium impact] The PR appears safe to merge; no blocking issues were found.

Summary

Cross-tab storage updates now sync every sync=True variable that shares a storage name.

• A storage change updates every synced variable that shares its name.

_{Reviews (4) · Last reviewed commit: "Merge branch 'main' into fix-storage-syn..." · Reviewed by Greptile}

[codspeed]

Merging this PR will not alter performance

⚠️ 9 benchmarks spent significant time in system calls

System calls cannot be consistently instrumented, so they are not included in the measure, which understates the real cost. Please switch to the Walltime instrument to accurately measure system calls.

Measurement and system calls

• test_import_cli
• test_cli_startup[version]
• test_cli_startup[help]
• test_set_state[disk]
• test_modify_state[disk]
• test_cli_startup[run_help]
• test_cli_startup[cloud_help]
• test_cli_startup[deploy_help]
• test_python_process_startup

✅ 148 untouched benchmarks

---

_{Comparing flcrom:fix-storage-sync-shared-name (cadf7a6) with main (2fc4a9c)}

[masenf]

looks good. rebase on main now that your other PR has merged

[flcrom]

Rebased onto main (f88486b).

[masenf]

appreciate it