fix(touch): allow pointerDown veto to stop tracking and free scroll

[ChronosSF]

IgxTouchManager starts tracking on every accepted pointerdown and, via its non-passive touchmove listener, calls preventDefault() while tracking. When attached to document (e.g. Navigation Drawer), this cancels normal page scrolling even when the consumer would ignore the gesture. Addresses the review comments in pullrequestreview-4787557464.

Changes

• core/src/core/touch.ts

  • pointerDown callback signature is now (event: IgxGestureEvent) => boolean | void.
  • When pointerDown returns false, the manager stops tracking immediately via a new _stopTracking() helper — resets _tracking/_panStarted/_pointerId/_startTarget and best-effort releases pointer capture — so touchmove no longer suppresses scrolling for vetoed gestures.

• navigation-drawer/.../navigation-drawer.component.ts

  • panStart (wired as the drawer's pointerDown) now returns boolean: true when a pan is accepted (drawer open, or touch starts within maxEdgeZone), false otherwise (gestures disabled, pinned, non-touch, or touch outside the edge zone), letting the manager bail out and leave scrolling intact.

// touch.ts
if (this.callbacks.pointerDown?.(this._createEvent(event)) === false) {
    this._stopTracking(event.pointerId);
}

Returning nothing preserves the previous behavior, so other consumers are unaffected.

[Copilot]

Pull request overview

This PR adjusts the shared IgxTouchManager gesture tracking so consumers can veto a pointerdown and immediately stop tracking, preventing the manager’s non-passive touchmove listener from suppressing normal page scrolling (notably when gestures are attached on document, such as in Navigation Drawer).

Changes:

• Expanded IgxTouchManagerCallbacks.pointerDown to allow returning false and added _stopTracking() to immediately reset tracking state and best-effort release pointer capture.
• Updated Navigation Drawer’s panStart (used as pointerDown) to return true/false based on whether the gesture should be handled (edge-zone / open drawer) or ignored (allowing scroll).
• Includes package-lock.json changes that appear unrelated to the touch fix.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
projects/igniteui-angular/core/src/core/touch.ts	Adds a veto-able pointerDown callback contract and immediate tracking teardown to avoid blocking scroll for ignored gestures.
projects/igniteui-angular/navigation-drawer/src/navigation-drawer/navigation-drawer.component.ts	Makes panStart return a boolean to accept/veto gestures, enabling scroll-friendly behavior when touches start outside the edge zone.
package-lock.json	Contains lockfile diffs unrelated to the stated change; likely accidental/high-churn.