BHP1-1674 Give each app version its own browser cache

[rjsheperd]

Purpose

Every desktop build shared one Chrome cache (<app-data-dir>/.cache)
so a new version inherited the previous one's
LocalStorage — stale unit/decimal choices keyed by old VMS UUIDs, the
disclaimer flag, workflow state.

The cache path is now based on the version
(<app-data-dir>/cache/<version>).

Each version starts clean and keeps its own LocalStorage, IndexedDB
and HTTP cache, so older versions can still be run side
by side without being reset. Nothing is copied or deleted; the legacy .cache
stays for pre-change versions.

db.sqlite and logs/ are still shared across versions.

Related Issues

Closes BHP1-1674

Submission Checklist

• Included Jira issue in the PR title (e.g. BHP1-### <title>)
• Code passes linter rules (clj-kondo --lint components/**/src bases/**/src projects/**/src)
• Feature(s) work when compiled (clojure -M:compile-cljs)

Testing

1. Open a previous Behave executable (e.g. 7.1.5) and modify the
   Custom Unit preferences.
2. Download & open the test build from here
3. Verify that the Disclaimer pops up, and that Custom units have been reset

[Kcheung42]

Step 2 is missing the new test build url

[rjsheperd]

@Kcheung42 see https://github.com/firelab/behave-app/actions/runs/37667366512/artifacts/11502734755

[Kcheung42]

Tested and working. LGTM