fix(ui): align compact channel row consumers

docs/architecture/iptvnator-ui-guidelines.md

@@ -138,17 +138,22 @@ The shared row should be reused instead of rebuilding channel markup per view.
 ### Responsive Information Priority
 
 - EPG-enabled, noncompact rows keep a fixed `68px` height that matches the
-  virtual-scroll stride. EPG-disabled, compact rows retain their existing
-  `52px` minimum height.
+  virtual-scroll stride. EPG-disabled, compact rows use a matching fixed `52px`
+  row and virtual-scroll size.
 - At `310px` and below, hide the end time while keeping the start time and
   progress bar.
 - At `270px` and below, hide the decorative logo while retaining program
   context and actions, and tighten horizontal padding to preserve the remaining
   content.
 - At `220px` and below, hide the start time while keeping the progress bar.
-- Narrow width alone must not remove the channel name, program title or
-  no-program placeholder, progress bar, drag affordance when applicable, or
-  enabled actions.
+- In EPG-preview rows, narrow width alone must not remove the channel name,
+  program title or no-program placeholder, progress bar, drag affordance when
+  applicable, or enabled actions.
+- Radio consumers without EPG render the row as compact instead of showing a
+  false no-program placeholder. Compact rows keep the logo at `270px`, then
+  hide the logo and actions at `220px`.
+- `isRadio` alone must not change row height inside a fixed-size mixed virtual
+  list; the consumer's `showEpg` state and virtual-scroll item size own density.
 - Loading skeletons mirror the same responsive hierarchy and row geometry.
 
 ### Logo Rules

docs/superpowers/plans/2026-07-30-responsive-channel-epg-preview.md

@@ -245,7 +245,9 @@ Replace the current `max-width: 220px` action-hiding rule with:
 The end time is already hidden by the wider breakpoint. Channel name, current
 programme or placeholder, progress, drag affordance, and every enabled action
 remain available in EPG rows. The `.compact` branch deliberately preserves the
-existing radio/non-EPG degradation.
+existing non-EPG degradation; radio-only consumers without EPG opt into that
+branch through `showEpg=false`, rather than changing mixed-list height through
+`isRadio`.
 
 - [ ] **Step 4: Match skeleton degradation to the live row**
 

docs/superpowers/specs/2026-07-29-responsive-channel-epg-preview-design.md

@@ -54,8 +54,10 @@ loading content does not jump between incompatible layouts.
 and global channel lists. The contract therefore applies consistently wherever
 the host becomes narrow. This PR does not add provider-specific overrides.
 
-Radio rows and compact rows without EPG keep their existing behavior. The
-change does not add EPG data where a consumer currently disables it.
+Compact rows without EPG keep their existing behavior. Radio-only consumers
+that do not expose EPG mark their rows compact; `isRadio` alone never changes
+height inside a fixed-size mixed virtual list. The change does not add EPG data
+where a consumer currently disables it.
 
 ## Alternatives Considered