Improve selection menu UX and plugin action overflow

[bajrangCoder]

Summary

Improves the editor selection menu.

Changes

• Keep common actions in a compact, stable toolbar:
  • Copy
  • Cut
  • Paste
  • Select all
• Use an icon-only overflow button.
• Use a horizontal action strip for small overflow sets.
• Automatically switch large action sets to a vertically scrollable icon grid.
• Preserve icon-only plugin actions without requiring names.
• Show Code actions only when an LSP code-action provider is available.
• Prevent the selection menu from blinking or immediately reopening after an action.
• Improve pointer and accessibility activation handling.
• Add smooth Motion animations with reduced-motion support.
• Preserve the existing:
  • Theme-controlled border radius
  • Action sizing
  • Colors
  • Pressed and active states
• Keep the selection-menu registration API backward compatible.

[greptile-apps]

Greptile Summary

The PR reorganizes the touch selection menu into stable primary and overflow action groups, adds accessible pointer and keyboard activation, and conditionally exposes code actions.

• Adds movement and final-displacement guards that prevent scroll gestures from activating actions.
• Adds compact and grid overflow layouts with animation and reduced-motion handling.
• Preserves plugin action compatibility while adding action metadata and LSP capability filtering.
• Adds unit coverage for action partitioning and pointer cancellation behavior.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/cm/selectionMenuUtils.ts	Adds action metadata, primary/overflow partitioning, and pointer activation that checks movement both during the gesture and at release.
src/cm/touchSelectionMenu.js	Reworks menu rendering, overflow presentation, animation, action dismissal, positioning, and code-action availability.
src/lib/selectionMenu.js	Adds stable IDs and accessible labels while preserving the existing registration arguments and making metadata optional.
src/main.scss	Defines compact toolbar, horizontal overflow, scrollable grid, pressed-state, and focus-visible styling.
tests/unit/selectionMenuButton.test.ts	Covers single activation, cancellation, movement suppression, and final pointer displacement.
tests/unit/selectionMenuUtils.test.ts	Covers primary and overflow partitioning for selection and caret states.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  S[Selection state] --> F[Filter available actions]
  F --> P[Partition primary and overflow]
  P --> T[Compact primary toolbar]
  P --> O[Scrollable overflow]
  O --> G{More than ten actions?}
  G -->|No| H[Horizontal strip]
  G -->|Yes| V[Vertical icon grid]
  T --> A[Pointer or keyboard activation]
  H --> A
  V --> A
  A --> M{Pointer moved beyond tolerance?}
  M -->|Yes| C[Cancel activation]
  M -->|No| E[Execute action and dismiss menu]

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_{Reviews (3): Last reviewed commit: "fix(editor): validate pointer displaceme..." | Re-trigger Greptile}

[RohitKushvaha01]

LGTM!

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