ADR-019: Minor UX polish gaps — keyboard shortcuts & responsive auto-collapse

[amiable-dev]

Context

ADR-019 (Unified Workspace Filtering & Aggregate Metrics) is fully implemented across all 7 phases (#633–#644). Three minor UX polish items from the spec remain unimplemented.

Gaps

1. Numeric device quick-select shortcuts (D11)

ADR-019 D11 specifies 1–9 to quick-select a device by index and 0 to select all devices when the filter pane is expanded. Not currently implemented in any component.

2. Auto-collapse at <500px (D3)

ADR-019 D3 specifies: "when workspace width drops below 500px, auto-collapse to summary and switch to compact density." No width-based responsive logic exists — manual collapse works fine.

3. F / Shift+F standalone keyboard shortcuts (D11)

ADR-019 D11 specifies F to toggle Signal Flow filter collapse and Shift+F to toggle Events filter collapse when those containers are focused. These may only work via FilterSummaryBar click handlers, not as standalone key handlers on the focused container.

Acceptance Criteria

• Pressing 1–9 when filter pane is expanded selects the Nth device; 0 selects all
• Signal Flow filter toolbar auto-collapses when workspace width < 500px and switches to compact density
• F key toggles Signal Flow filter expand/collapse when workspace is focused
• Shift+F toggles Events filter expand/collapse when Events sidebar is focused
• Shortcuts only fire when the relevant container has focus (not during chat input or mapping editing)

Priority

Low — these are UX polish items, not architectural gaps. Core filtering, shared stores, link/unlink, aggregate metrics, and cross-panel integration are all working.

References

• ADR-019: docs/adrs/ADR-019-unified-workspace-filtering-and-aggregate-metrics.md
• D3 (Collapsible Unified Filter Pane)
• D11 (Keyboard Shortcuts)