Space-specific sources

[fbacall]

Summary of changes

• Sources are now tied to the space they are created in.
• Resources ingested from a source are tied to the space of the source.
• Allow the "view content from any space" filter to be used by anyone.
• UI improvements to spaces index and form.
• Simplify some policies.

Motivation and context

Allows ingestors to be used in spaces.

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 implements space-specific sources functionality, allowing sources to be tied to specific spaces within the TeSS platform. Resources ingested from a source now inherit the source's space, and space administrators gain the ability to manage sources within their spaces.

Key changes:

• Sources can now be associated with a space via new space_id foreign key
• Resources created by ingestors inherit the space from their source
• Cross-space content filtering is now available to all users (previously admin-only)

Reviewed changes

Copilot reviewed 45 out of 45 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
db/migrate/20250807085314_add_space_id_to_sources.rb	Adds space_id foreign key to sources table
db/schema.rb	Updated schema with space_id column and foreign key for sources
app/models/source.rb	Includes InSpace module for space association
app/models/default_space.rb	Adds administrators method returning admin users
app/models/user.rb	Adds has_role_in_any_space? helper method
lib/ingestors/ingestor.rb	Sets space_id on ingested resources from source
lib/facets.rb	Removes admin-only restriction from across_all_spaces filter
app/policies/application_policy.rb	Adds helper methods for space-aware role checks (user_has_role?, scraper?)
app/policies/source_policy.rb	Updates approve? to use user_has_role? helper
app/policies/content_provider_policy.rb	Adds create_source? policy method
app/policies/*_policy.rb	Refactors to use new helper methods from ApplicationPolicy
app/controllers/sources_controller.rb	Sets space on source creation; updates authorization to use create_source?
app/controllers/*_controller.rb	Changes redirect URLs from _url to _path helpers
app/mailers/curation_mailer.rb	Sends source approval emails to space administrators
app/views/search/common/_facet_sidebar*.html.erb	Moves cross-space filter to main sidebar (available to all)
app/views/layouts/_user_menu.html.erb	Adds space admin menu items with proper permission checks
app/views/spaces/*	UI improvements including theme selector and space listing
app/assets/stylesheets/*	Styling updates for theme selector and block items
config/tess.example.yml	Fixes missing # in green theme color code
config/locales/en.yml	Updates cross-space filter text and adds current_space_admin label
test/*	Comprehensive tests for space-based source permissions and functionality

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[Copilot]

Inaccurate comment: The comment says "Source has default language set" but this test is about setting the space from the source, not the default language. Update the comment to accurately reflect what the test is demonstrating, such as "Source has space set".