* feat(web): group consecutive tool-use cards
Add a web-only visible projection that groups consecutive root-level execution tools into expandable cards.
Keep approval and question tools standalone, reuse older-history loading on expand, and add regression coverage for grouping and UI behavior.
* fix(web): hydrate oldest visible tool group
Mark needsOlderHistory on the first visible grouped tool run even when earlier visible blocks are non-tool content, and add regression coverage for the boundary.
* fix(web): continue grouped history hydration
Decouple ToolGroupCard older-history chaining from the shared loading flag, invalidate stale hydration runs safely, and add regression coverage for multi-page hydration.
* fix(web): harden grouped tool hydration
- retry incomplete group hydration after transient pagination contention\n- keep approved and denied permissioned tool cards eligible for grouping\n- cover both regressions with targeted web tests
* fix(web): keep Codex permission cards standalone
- treat CodexPermission as a semantic grouping boundary even after approval\n- keep permissioned execution tools groupable while preserving permission milestones\n- add regression coverage for Codex permission eligibility and boundary behavior
* fix(web): narrow incomplete tool-group hydration
- only mark groups at the oldest visible boundary as needing older history\n- avoid auto-paginating complete groups behind text, standalone tools, or permission milestones\n- add regression coverage for the adjacent boundary cases
