feat(app): add Veyra approvals and chat polish

[fschrhunt]

What changed

• Adds the Veyra approval bridge in Halos, including local event handling, approval card rendering, and resolve actions back to Veyra.
• Adds shared Halos glyph/storage support used by the updated chat and app surfaces.
• Carries forward the verified chat polish bundle: response indicator/icon work, tool summaries, system-message handling, scroll behavior, and related UI tests.

Why

Halos needs to render plugin approval flows and keep the chat/workstream surface stable while Huma is running tools. This bundles the app-side changes that compile together.

Verification

• swift test
• ./script/build_and_run.sh --verify

Risk

Broad UI surface area changed, especially chat rows/tool summaries and icon assets. Manual app smoke testing is recommended before merge.