fix(banner): unify padding at half original for both single and multi

.console/log.md

@@ -3,6 +3,8 @@
 _Chronological continuity log. Decisions, stop points, what changed and why._
 _Not a task tracker — that's backlog.md. Keep entries concise and dated._
 
+- Banner padding unified at half original (2026-05-08, on fix/banner-half-padding): Both single and multi-banner now use lp=(w-1)//4 and g=max(6,(w-1)//6) — half the original multi-banner values. Removes the single/multi branch entirely.
+
 - Banner single-loop padding at half size (2026-05-08, on fix/banner-single-padding): Single-banner re-stream gets lp=(w-1)//4 and g=max(6,(w-1)//6) — half the original values — so there's a visible breath between loops. Multi-banner keeps lp="" and g="    " (4 spaces); the crossfade coloring is the boundary signal there.
 
 - Banner padding stripped (2026-05-08, on fix/banner-strip-padding): Removed leading pad (`(w-1)//2` spaces) and large gap (`max(12, (w-1)//3)` spaces) from `_build_unit` and `_banner_unit_len`. Both cases now use a fixed 4-space separator between units — the tape streams the next banner in seamlessly so the large pads were dead space.

src/operator_console/watcher_status_pane.py

@@ -1208,12 +1208,8 @@ def _banner_unit_len(message: str, banner_count: int, banner_index: int, w: int)
     """
     counter = f"  [{banner_index + 1}/{banner_count}]" if banner_count > 1 else ""
     payload = f" {message}{counter} "
-    if banner_count == 1:
-        lp = " " * ((w - 1) // 4)
-        g  = " " * max(6, (w - 1) // 6)
-    else:
-        lp = ""
-        g  = "    "
+    lp = " " * ((w - 1) // 4)
+    g  = " " * max(6, (w - 1) // 6)
     return len(lp) + len(payload) + len(g)
 
 
@@ -1284,12 +1280,8 @@ def _build_unit(b_severity: str, b_message: str, b_idx: int) -> tuple[str, str]:
         """Return (full_unit_text, severity) for one banner condition."""
         ctr = f"  [{b_idx + 1}/{banner_count}]" if banner_count > 1 else ""
         payload = f" {b_message}{ctr} "
-        if banner_count == 1:
-            lp = " " * ((w - 1) // 4)
-            g  = " " * max(6, (w - 1) // 6)
-        else:
-            lp = ""
-            g  = "    "
+        lp = " " * ((w - 1) // 4)
+        g  = " " * max(6, (w - 1) // 6)
         return lp + payload + g, b_severity
 
     severity, message = current_banner