feat(portal): add conversation bindings management panel

[sytone]

Closes #140

Changes

ConversationBindingsPanel.razor

New Blazor component at Components/ConversationBindingsPanel.razor:

• Renders all channel bindings for a conversation in a table (channel type, address, thread ID, mode, bound-at)
• Add Binding form with channel type, address, optional thread ID, mode select (Interactive/Notify/ReadOnly)
• Form validation: both channel type and channel address required before POST
• Remove Binding with confirmation dialog before DELETE
• Status notifications (auto-dismiss 4s) for add/remove outcomes
• Error handling: loading failure shows human-readable error, retry via Reload button
• Accessible: aria-label, aria-required, role=alertdialog, role=alert, role=status

Tests (8 tests)

• Shows_loading_spinner_initially
• Shows_empty_state_when_no_bindings
• Displays_bindings_in_table
• Shows_add_binding_form_when_add_button_clicked
• Cancel_add_form_hides_form
• Delete_button_shows_confirmation_dialog
• Shows_error_when_load_fails
• Add_binding_form_validation_shows_errors

Note: This PR covers the portal UI portion of #140. The REST API (POST /bindings, DELETE /bindings/{id}, POST /bindings/{id}/move) is already implemented and merged in PR #488. The move UI is a follow-up.

[sytone]

CI: All checks passing
Merge conflicts: Clean / MERGEABLE
Commit title: Conventional commit format correct
Coverage: 8 bUnit tests for view, add, remove, error handling
Spec completeness: Closes partial #140 (portal UI for binding management) - view/add/remove bindings implemented; portal REST calls match existing endpoints

LGTM - ready to merge.

[sytone]

CI: ✅ All checks passing
Merge: CLEAN — no conflicts
Commit title: feat(portal): add conversation bindings management panel ✅ Conventional commit
Coverage: 8 bunit tests covering view, add, remove, error paths
Spec completeness: Partial #140 — portal binding management view/add/remove; move endpoint in #488; portal move UI still open

LGTM — ready to merge.

[sytone]

Farnsworth Review — PR #493

CI: ✅ All checks passing
Merge conflicts: ✅ Clean (MERGEABLE)
Conventional commit title: ✅ feat(portal): add conversation bindings management panel

Test coverage:

• ✅ 8 bunit tests (view, add, remove, error handling)
• Full suite passes clean

Spec completeness vs #140 (partial): Binding view/add/remove correctly implemented. Portal UI component satisfies the partial scope. Move-binding endpoint is in PR #488.

LGTM. Ready to merge.

[sytone]

Closing as part of a planned hard-reset of the in-flight branch set so the new domain-model refactor can land on a clean trunk.

Audit verdict: close

Rationale: UI surface for ChannelBinding which changes in Phase 6b. Rebuild on new shape.

The new plan (in session state) reshapes core types: Citizen (User+Agent union), Vogen-generated value objects, ThreadId removed in favour of composite ChannelAddress, mark-not-delete compaction, centralised SessionContextProjector, single-path routing. Many in-flight branches touch contracts that are about to change — rebasing later would be more work than rebuilding on the new shape.

If this work is still wanted, refile as a new issue/PR against the post-refactor contracts.