PR-07b Asset Navigator and Row Subscriptions

Domain owner: docs/studio

Briefing

Refactor the navigator side of the Assets workspace so the list and each asset row update through event subscriptions instead of workspace-wide rerendering.

Objective

Make navigator behavior event-directed and component-local.

After this PR:

the navigator list subscribes to projection changes it actually needs;
each asset row subscribes to row-scoped summary/selection updates;
search and filters change the navigator projection without rebuilding the whole workspace;
selection styling and row patching happen without forcing a full list refresh from the workspace root.
the navigator and row patterns are implemented in a way that other Studio workspaces can reuse for list/detail navigation surfaces.

Dependencies

Scope

extract the navigator into dedicated controls
separate navigator projection calculation from visual control ownership
introduce row-scoped subscriptions and row identity handling
keep reusable list/projection primitives outside Assets-only naming where they are genuinely cross-workspace
publish projection updates for:
- search changes
- filter changes
- structural asset collection changes
- per-asset summary patches
- selection changes
remove direct row bookkeeping from the workspace root where possible

Non-Goals

no details-panel refactor in this slice
no final mutation confirmation flow refactor in this slice
no broad service-layer redesign beyond what navigator subscriptions require

Execution Method

Introduce an AssetNavigatorControl or equivalent host with lifecycle-managed subscriptions.
Extract row rendering into an AssetRowControl or equivalent lifecycle-managed component.
Move search/filter handling to event publication plus projection recalculation.
Publish selection updates as typed events that row controls can consume directly.
Replace root-owned row maps and manual selection restyling with row-scoped update flow.

Acceptance Criteria

asset rows are no longer rebuilt by default on every local navigator change
search and filter changes update the navigator projection only
selecting an asset updates only the controls that depend on selection
patching one asset summary updates the affected row without requiring a full workspace reload
navigator controls subscribe and unsubscribe through the lifecycle support
reusable navigator/list subscription patterns are left available for future Studio workspaces

Validation

unit tests for navigator projection event flow
unit tests for row identity stability across patches
unit tests for selection update behavior without full projection rebuild
UI smoke validation for search, filters, and selection transitions

Affected Artifacts

prometeu-studio/src/main/java/p/studio/workspaces/assets/AssetWorkspace.java
new navigator and row controls under prometeu-studio/src/main/java/p/studio/workspaces/assets/...
prometeu-studio/src/main/java/p/studio/events/...
tests for navigator projection and row update behavior

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