P2 smooth scrolling and fast find navigation

[masarray]

P2 — Interaction, Smooth Scroll & Fast Find

Presentation-only interaction layer focused on dense IEC 61850 engineering workflows.

Smooth scrolling

• Keeps WPF virtualization enabled and switches virtualized ItemsControls to pixel scroll units.
• Adds accumulated 60 FPS eased mouse-wheel scrolling instead of row-by-row jumps.
• High-resolution touchpad deltas stay proportional instead of being quantized to 120-delta wheel notches.
• Preserves Ctrl+wheel, Shift+wheel, ComboBox dropdown scrolling, multiline TextBox scrolling, scrollbar dragging, and nested-scroll boundary bubbling.
• Deferred scrollbar scrolling is disabled so dragging the thumb updates content live.

Fast find

• Injects a compact Find IED field above the IED Explorer list without changing the existing XAML/data model.
• Searches IED name, IP, endpoint, status, identity source, logical-device summary and SCL identity.
• Shows live match counts and supports Enter / Shift+Enter cycling.
• Existing selected-IED Live Values and Global Multi-IED Live Monitor searches gain visible match counts plus Enter / Shift+Enter / F3 result navigation and automatic ScrollIntoView.

Shortcuts

• Ctrl+F focuses the context live-value search (Explorer or Global Live Monitor).
• Ctrl+K or Ctrl+Shift+F jumps to Explorer and focuses Find IED.
• F3 / Shift+F3 moves next / previous in the active search.
• Esc clears the active search box.

Safety boundary

No changes to Services/*, IEC 61850 acquisition/reporting, report-control planning, SOE semantics, Smart Control, Alarm state machine, GOOSE parser/runtime, or engines/ARIEC61850.lock.json.

Regression coverage

Adds P2InteractionRegressionTests for virtualization-preserving pixel scroll, modifier gesture preservation, IED finder fields, existing live-search integration, keyboard fast-find shortcuts, and the presentation-only boundary.

Verification

Exact head 832f7d90b4f4af778547cf4ee2504e729ebd4517 passes Build ARSAS #1244, full solution build and regression suite, SV evidence #375, portable single-EXE publish, portable startup smoke, and artifact upload.

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