Adds a getOwnerSettings read query to scheduler_core (previously only
an internal helper existed) and an updateOwnerSettings command on the
Flutter command controller, then builds a shared Settings dialog
surfacing timezone, day window, compact mode, and backlog staleness
thresholds. Both existing no-op entry points (sidebar nav item, top
bar button) now open the same dialog and persist edits through the
existing OwnerSettings/BacklogStalenessSettings backend.
Per the design spec (circuitforge-plans/focus-flow/superpowers/specs/
2026-07-07-settings-screen-design.md), the compact-mode toggle
persists but is disclosed in-UI as not yet affecting Today rendering,
since that wiring is separate scope (#11).
Closes: eva/focus-flow#16
Backend was already V1-complete for these paths (moveFlexibleToBacklog,
breakUpTask); this closes the UI-wiring gap identified in the V1
feature-complete audit.
- Add createBacklogController() to SchedulerAppComposition and implement it
in PersistentSchedulerComposition (only the demo composition had one).
- Sidebar now switches the main content area between Today and Backlog via
a real SidebarScreen enum instead of hardcoded onTap: () {} stubs.
- Task modal's "Backlog" quick-action reuses the existing onPushToBacklog
wiring (same backend command as the Push menu's "Push to backlog").
- Add a break-up dialog (row-level title/priority/reward/duration per
MVP-AC-11) and SchedulerCommandController.breakUpTask(), wired to the
modal's "Break up" button.
- Fix a latent bug where the active sidebar nav item's key was hardcoded
to nav-today-active regardless of which item was active.
Closes: #9
Closes: #12
Closes: #13
