Expand the provider-neutral core icon catalog

[konojunya]

Background

The bundled catalog currently covers 12 broad client and compute concepts, while common network, delivery, data, development, and collaboration roles require either fallback artwork or vendor-specific packs. Brand and vendor artwork remains user-imported; the core catalog should provide a more useful provider-neutral baseline without redistributing third-party assets.

Implementation Approach

• bump the catalog and both distribution packages to 0.4.0
• add 18 original Stack-authored 24x24 outline SVGs, expanding the explicit catalog from 12 to 30 icons
• cover networking, delivery, events, search, analytics, source workflows, secrets, general collaboration tools, and AI systems
• preserve the existing node-kind fallbacks and user-imported provider-pack boundary
• regenerate identical Cargo and npm catalog artifacts with revision sha256:9cb3de8b504acbf22c93cea5fbea66be50f38734dc1dee18b9cab7084082cc1f
• add a regression test for Apache-2.0 provenance, redistribution permissions, and single-color currentColor rendering

Testing Approach

• npm run validate
• npm run generate:check
• npm test
• npm run typecheck
• cargo +stable fmt --check
• cargo +stable test --workspace --locked
• cargo +stable clippy --workspace --all-targets --locked -- -D warnings
• RUSTDOCFLAGS="-D warnings" cargo +stable doc --workspace --no-deps --locked
• cargo +1.85.0 test --workspace --locked
• cargo +1.85.0 clippy --workspace --all-targets --locked -- -D warnings
• npm pack --dry-run --json --workspace @stack-sh/theme
• cargo +stable package -p stack-theme --locked
• reviewed the dependency-free gallery at 1440x1000 and 390x844: 3 themes, 30 fallbacks, 90 explicit cards, and 120 inline SVGs; no horizontal overflow, clipped cards, console errors, page errors, or failed requests

Review Perspectives / Points of Concern

• confirm that each added icon reads as a generic concept rather than a particular vendor or product mark
• compare gateway, load-balancer, dns, cdn, network, and ai for visual distinction at small sizes
• confirm the additive 0.4.0 catalog version and the planned provider-first merge order before Engine integration
• no third-party visual asset or vendor byte is included