fix: json popups no longer open as a monitor-tall strip

Two composing bugs. The compositor mode-forces cce-cloud app_ids to Overlay
(ignoring the window-management popup flag), and Overlay's fresh-slot
configure is full usable height; the json path obeyed that configure and
never sized itself again (dmenu always recovered because every stdin batch
re-runs update_desired_size). Now the configure handler re-asserts the
content-derived size after applying the compositor's, and the commit updates
box_geom, which the compositor's stored-geometry path respects.

Also stop using the crude pre-layout height estimate as the json growth cap
— it ignores per-widget label offsets, so the accurately measured page
height was clipped against it (the Cancel-button-cut-off state). The cap is
now the caller's explicit height when given, else 600.

Co-Authored-By: Claude Fable 5 <[email protected]>

 src/main.rs | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index ddce1f0..d8c20ff 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -972,7 +972,17 @@ impl State {
 
             fade_factor: 1.0,
             max_width: width,
-            max_height: height,
+            // For json mode the initial `height` is a crude pre-layout estimate
+            // (it ignores per-widget label offsets), so it must not double as the
+            // growth cap — the accurately measured page height would be clipped
+            // against it. Cap at the caller's explicit height when given, else a
+            // sane maximum; update_desired_size resizes to the measured content
+            // within that.
+            max_height: if mode == LauncherMode::Json {
+                json_layout_config.as_ref().and_then(|c| c.height).unwrap_or(600)
+            } else {
+                height
+            },
             select_item,
             switcher_mode,
             last_tick: std::time::Instant::now(),
@@ -1808,6 +1818,14 @@ impl WindowHandler for AppState {
                 let pw = (width as f64 * state.scale) as u32;
                 let ph = (height as f64 * state.scale) as u32;
                 state.resize(pw, ph);
+                // Re-assert the content-derived size. The compositor's overlay
+                // fresh-slot configure arrives full-height (cce-cloud app_ids are
+                // mode-forced to Overlay); obeying it verbatim left --json popups
+                // as a monitor-tall strip. Dmenu mode always recovered because
+                // every stdin batch re-runs this — json got sized exactly once,
+                // before the configure. The commit below updates box_geom, which
+                // the compositor's stored-geometry path then respects.
+                state.update_desired_size();
             }
         }
         self.redraw = true;