Spaces feature improvements

[fbacall]

Summary of changes

• Hide front page counters for features that are not enabled in the current space.
• Allow hiding of the spaces index from the directory dropdown (still accessible from footer)

Motivation and context

Hiding empty/irrelevant content.

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree
  to license it to the TeSS codebase under the
  BSD license.

[Copilot]

Pull request overview

This PR enhances the spaces feature by allowing fine-grained control over feature visibility within individual spaces. The changes enable space administrators to hide disabled features from the front page counters and optionally hide the spaces index from the navigation dropdown while keeping it accessible via the footer.

Changes:

• Added 'spaces' to the list of features that can be disabled per-space
• Updated counter display logic to respect space-specific feature flags
• Added a "Browse Spaces" link to the footer for global spaces access

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
app/models/space.rb	Added 'spaces' to FEATURES constant to enable per-space control
app/views/static/home/_counters.html.erb	Changed feature filtering to use feature_enabled? helper, respecting both global and space-specific flags
app/views/layouts/_footer.html.erb	Added "Browse Spaces" link to footer with global feature flag check
config/locales/en.yml	Added browse_spaces translation key for the footer link
test/controllers/static_controller_test.rb	Added tests for disabled feature counter hiding and spaces index visibility behavior
test/controllers/spaces_controller_test.rb	Updated test count to reflect addition of 'spaces' to available features

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