The functional behavior is consistent across the side-info layouts, but the patch currently fails git diff --check because of newly introduced trailing and mixed indentation whitespace. Please clean up the flagged lines before merge.

Reviewed the current patch. The prior whitespace concern is resolved, git diff --check passes, and the wide-screen collapse logic preserves narrow-screen and hide-side-info overlay behavior. Maven compilation could not be run because neither mvn nor a Maven wrapper is available in this environment.

The latest commit reintroduces whitespace errors in side-info.js, as detailed inline. Please clean up both flagged lines so git diff --check passes.

Reviewed the current head. The earlier whitespace regression is fixed: git diff --check passes, and the wide-screen collapse state and trigger synchronization preserve overlay-only click-outside and Escape behavior. No blocking issues found. Maven compilation could not be rerun because neither mvn nor a Maven wrapper is available in this environment.

Changes requested: viewport transitions currently carry the wrong closed state across the pinned/overlay breakpoint, causing an open overlay after narrowing and preventing saved/default pinned visibility from being restored after widening. git diff --check and JavaScript syntax validation pass.

The breakpoint-state synchronization is fixed, but wide-screen keyboard collapse remains broken: Escape is restricted to overlay mode. Please restore Escape closing for pinned panes. git diff --check and JavaScript syntax validation pass; Maven is unavailable in this environment.

Restored Escape closing for wide pinned side-info panes. Click-outside close remains limited to overlay mode.

@cwh Escape should be disabled for pinned mode. Also please explain more for this problem:

Changes requested: viewport transitions currently carry the wrong closed state across the pinned/overlay breakpoint, causing an open overlay after narrowing and preventing saved/default pinned visibility from being restored after widening. git diff --check and JavaScript syntax validation pass.

The latest fix restores Escape closing for both pinned and overlay side-info panes while keeping click-outside closing limited to overlay mode. Breakpoint transitions preserve the saved/default pinned visibility state. git diff --check and JavaScript syntax validation pass; no blocking issues found. Maven compilation was not available because neither Maven nor a Maven wrapper is installed in this environment.

Addressed the latest concern: Escape is again limited to overlay mode, so pinned panes only collapse through the explicit controls.

The earlier breakpoint bug came from treating the DOM closed class as state shared by pinned and overlay layouts. Without transition synchronization:

• Narrowing while the pinned pane was open carried that open state into overlay mode.
• Closing in overlay mode and then widening carried the closed DOM state back, instead of restoring the saved/default pinned visibility.

The breakpoint listener now detects mode changes, closes when entering overlay without overwriting the pinned visibility cookie, and restores the cookie/default state when returning to a wide pinned layout.

Validation passed: node --check, git diff --check, and mvn -Pce -pl server-core -am -DskipTests compile.

Reviewed the current head. The wide-screen collapse controls and persisted pinned visibility behave consistently across pinned and overlay layouts, including viewport transitions; Escape and click-outside closing remain limited to overlay mode. git diff --check and JavaScript syntax validation pass. No blocking issues found.