refactor(angular): thread FileAction through one command path (remove 5-layer six-action fan-out)

[nitrobass24]

Context

From a repo-wide over-engineering audit (ponytail-audit). The six file actions (queue, stop, extract, deleteLocal, deleteRemote, validate) are written out longhand across five layers — ~30 near-identical methods differing only by a URL verb, a log noun, or a status guard. Estimated cut: ~150 lines.

Findings

1. ModelFileService (src/angular/src/app/services/files/model-file.service.ts): 6 methods differing only by URL verb.
2. ViewFileCommandService (services/files/view-file-command.service.ts): 6 methods differing only by log noun.
3. ViewFileService (services/files/view-file.service.ts:152-176,207-227): 6 pure pass-through facades + 4 bulk facades.
4. FileListComponent (pages/files/file-list.component.ts:143-193,230-233): 6 byte-identical onX subscribe blocks + 4 onBulkX.
5. FileComponent (pages/files/file.component.ts:122-145,168-197): 6 onX handlers + 6 isX guards.

Task

Thread the existing FileAction enum through one command(action: FileAction, file: ViewFile) per layer:

• One table (per action: URL segment, log noun, capability flag) at the lowest layer that needs each datum.
• Components call onAction(action, file) / onBulkAction(action); templates pass the enum member.
• Capability guards (isQueueable etc.) can stay as data lookups against the same table.

Constraints

• HTTP endpoints, request shapes, and user-visible log/notification text unchanged.
• Bulk actions keep their forkJoin semantics.
• Follow the Angular mutating-service contract in CLAUDE.md (mutations inside the returned pipeline via tap, typed WebReaction results — don't regress this).
• Update specs to the new single entry point; per-action coverage can become a parameterized loop over the 6 actions so no action loses a test.
• npx ng lint and npx ng test pass (Node ≥22.22.3 required locally).

Acceptance

• One command path per layer; no per-action method sextuplets remain
• All 6 actions still covered by tests (parameterized)
• Lint + unit tests pass; e2e file-action flows unaffected

Workflow: branch refactor/file-action-fanout off develop, PR to develop.