🐛 fix(filter): add bottom margin to prevent footer overlap

Add margin-bottom: 1 to FilterInput to ensure proper spacing above
the footer. Previously, the filter input overlapped with the footer's
keyboard shortcuts when activated with '/'.

Author: NikiforovAll

src/lazyclaude/styles/app.tcss

@@ -123,12 +123,12 @@ FilterInput {
     height: 3;
     border: solid $accent;
     padding: 0 1;
+    margin-bottom: 1;
     display: none;
 }
 
 FilterInput.visible {
     display: block;
-    margin-bottom: 0;
 }
 
 FilterInput:focus-within {

src/lazyclaude/widgets/filter_input.py

@@ -21,6 +21,7 @@ class FilterInput(Widget):
         height: 3;
         border: solid $accent;
         padding: 0 1;
+        margin-bottom: 1;
         display: none;
     }