refactor(sync-queue): separate change state from sync action in UX

[ClaudiaFang]

Separate change state (repository tree: M/A/D badges) from sync action (queue: ↑↓↺🗑 glyphs) so the Sync Queue shows what will happen, not what already happened.

Scope

Confined to the source-control layer (src/logic/source-control/* + src/ui/source-control/*). The src/logic/** sync domain (SyncManager/SyncPlanner/SyncExecutor/SyncPlanModal) is not touched.

Changes (7 stages)

1. SyncAction model — new src/logic/source-control/SyncAction.ts: SyncAction = 'upload'|'download'|'restore'|'delete-remote', resolveAction(kind), requiresChoice(kind), SyncActionItem.
2. SyncActionQueue — new src/logic/source-control/SyncActionQueue.ts (replaces PushSelectionStore): Map<ChangeId, SyncAction|undefined> with enqueue/dequeue/enqueueMany/dequeueMany/clear/has/getAction/getChangeIds/size/refresh. Action optional on enqueue; ViewModel resolves default at projection.
3. Queue presentation — ChangePresentation.ts drops changeOperation/ChangeOperation; adds ActionView/ACTION_ORDER/presentAction (glyph ↑↓↺🗑). ChangeItem.ts renderQueueItem uses .scv-action-glyph (no .scv-badge).
4. View routing — SourceControlView.ts groups the queue by ACTION_ORDER (group labels only when >1 action); runSync routes by item.action (upload→push, download/restore→pull, delete-remote→remote delete); toggleSelect triggers chooser for requires-choice (local-deleted).
5. Local-deleted chooser — new src/ui/source-control/LocalDeletedActionChooser.ts modal: Restore (CTA) / Delete remote / Cancel; wired in SourceControlItemView.
6. Callback wiring — SourceControlItemView.ts: onDeleteRemote→actionService.deleteRemote, onResolveLocalDeleted→chooser.
7. Tests — new SyncAction.test.ts + SyncActionQueue.test.ts; deleted PushSelectionStore.test.ts; mechanical rename across all affected tests + e2e.

Verification

• npx eslint . → 0 errors
• npm run build → clean (tsc + Obsidian 1.11.0 compat + esbuild)
• npx vitest run → 64 files / 712 tests pass
• ./init.sh → green
• Manual Obsidian verification (desktop + mobile): pending

Out of scope (deferred)

SyncPlanModal (driven by SyncPlan/PushCoordinator/PullCoordinator confirmPlan) still shows state-based plan rows during coordinator execution — fully refactoring it to action-based review would cross the src/logic/** sync-domain boundary.