feat: add stable workspace switch slots

[wibus-wee]

Related issue

Refs #288

Problem / pressure

Workspace switching was duplicated across sidebar, mobile, and organization selectors, while numeric shortcuts need stable targets that do not change when the organization catalog reorders. The shortcut lifecycle from #572 provides one command registration path, but there was no shared workspace transition boundary or durable 1-9 slot model.

Summary

• Add per-user, per-device workspace ID slots with deterministic initialization, removal without renumbering, reassignment uniqueness, malformed-data recovery, and cross-window storage synchronization.
• Route ordinary workspace selection through useWorkspaceSwitcher, then register Electron-only Mod+1..9 commands through the existing useCommand lifecycle and conflict index.
• Add slot assignment controls to Keyboard Shortcuts settings, English/Chinese copy, component integration coverage, and real two-window Electron shortcut smoke coverage.
• Keep sidebar swipe out of scope for the follow-up PR; this PR intentionally does not close Issue [Feature Request] Easier workspace switching: sidebar swipe and Cmd+1-9 shortcuts #288.

Visual explanation

flowchart LR
  A[Sidebar / mobile / selector] --> S[useWorkspaceSwitcher]
  B[Mod+1..9] --> C[CommandShortcutHost]
  C --> D[workspace.switchSlot.N]
  E[Keyboard settings] --> F[stable workspace ID slots]
  F --> D
  D --> S
  S --> G[preferred slug + workspace context]
  S --> H[active organization]
  S --> I[current window route]
  F <-. storage event .-> J[other renderer windows]

Loading

Before / after

Before	After
UI entry points independently updated organization and routing state.	Ordinary workspace changes share one workspace-ID transition boundary.
Numeric position depended on catalog presentation and had no command registration.	Slots persist stable workspace IDs and expose Electron Mod+1..9 through the unified command registry.
No workspace target configuration or two-window registration evidence.	Keyboard settings assign targets; component and Electron smoke tests cover state and renderer lifecycle.

Test plan

• pnpm check
• pnpm format
• pnpm run docs check
• pnpm e2e:check
• Fresh pnpm e2e:build
• pnpm e2e:smoke (4 P0 scenarios, 28 steps, including both Electron renderers)
• Focused workspace/command integration: 10 tests passed

Context handoff

Instructions for reviewing agents

• Review focus: Inspect the slot reconciliation/store, dynamic commands in app-commands.tsx, and useWorkspaceSwitcher state transition as the risk-bearing paths.
• Decisions to challenge: Validate stable ID slots, per-user local persistence, Electron-only defaults, and immediate optimistic workspace context publication.
• Plausible failures / evidence gaps: Public OSS E2E has one implicit workspace, so actual A-to-B navigation is exercised at the React command-host boundary while real Electron verifies registration in two windows.

Authoring context

• User goal / directives: Implement the workspace-switching PR after the shortcut lifecycle PR, including stable 1-9 slots, defaults, settings, conflict handling, and regression evidence.
• Constraints / non-goals: Preserve physical-key semantics and the unified refactor: centralize shortcut lifecycle with TanStack Hotkeys #572 lifecycle; sidebar swipe is a later PR and Issue [Feature Request] Easier workspace switching: sidebar swipe and Cmd+1-9 shortcuts #288 remains open.
• Risk-bearing decisions: Slot removal leaves a hole, reassignment moves an ID, storage is device-local and user-scoped, and switching publishes identity before best-effort organization activation.
• Destructive or irreversible behavior: Invalid stored slot payloads are cleared; removed workspace assignments are cleared without shifting surviving slots, and no server data is mutated by slot storage.
• Deliberately not done or tested: No cloud-only test backdoor was added to create a second OSS E2E workspace; component integration supplies two synthetic workspaces instead.
• Unknowns / confidence: Main residual risk is cloud organization activation failure after optimistic navigation; this preserves existing UI behavior and is independently reviewable in the shared switch hook.

Original user prompt

Show original prompt

可以来

[wibus-wee]

The design does not align with the expected UX direction; closing this PR.