Seconds per clock, and type that scales with the bar height

Seconds move from one bar-wide switch to a per-clock setting. A clock's own
`showSeconds` wins, the top-level one is the default for clocks with no
opinion, and the centre clock gets `local.showSeconds` since it has no entry in
`clocks[]`. An explicit false on a clock beats a true default, so the check is
for the property's presence rather than its truthiness.

The tick rate follows what is actually displayed: `anyShowsSeconds()` decides
between a per-second and a per-minute SystemClock, so a bar showing no seconds
does not wake the shell sixty times as often to redraw an identical minute.

`barSize` is now editable from the popup, and everything drawn on the bar is
sized against the theme's own bar height rather than pinned to the theme's
12px type. A taller bar carries proportionally larger text, gaps and rule; at
the theme's own height the scale is exactly 1, so nothing moves. Heights are
clamped to 12-120 rather than rejected, so a value the editor can produce can
never be one the config layer silently discards.

Fixes a latent bug this surfaced: updateRow() rebuilt a draft row from a fixed
pair of fields, so editing a clock's label would have thrown away its own
seconds setting. It now copies every key the row had.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MhxtL7WzL5XmuTd8GHbcTY

Clockbar.qml

@@ -33,15 +33,28 @@ Item {
   // stay the same weight when the theme or font size changes.
   readonly property int barSize: config && config.barSize > 0 ? config.barSize : Style.bar.sizeHorizontal
 
+  // Everything drawn on the bar is sized against the theme's own bar height,
+  // so a taller bar carries proportionally larger type and gaps rather than
+  // the theme's 26px-sized text marooned in the middle of it. At the default
+  // height this is exactly 1, which leaves the theme's own tokens untouched.
+  readonly property real barScale: Style.bar.sizeHorizontal > 0
+    ? barSize / Style.bar.sizeHorizontal
+    : 1
+
+  function scaled(px) { return Math.max(1, Math.round(px * root.barScale)) }
+
+  readonly property int timeFontSize: scaled(Style.font.body)
+  readonly property int labelFontSize: scaled(Style.font.caption)
+
   readonly property color background: Color.bar.background
   readonly property color foreground: Color.bar.text
   readonly property color muted: Color.muted
   readonly property color accent: Color.accent
   readonly property color urgent: Color.urgent
 
-  readonly property int edgePadding: Style.space(12)
-  readonly property int clockGap: Style.space(16)
-  readonly property int labelGap: Style.space(6)
+  readonly property int edgePadding: scaled(Style.space(12))
+  readonly property int clockGap: scaled(Style.space(16))
+  readonly property int labelGap: scaled(Style.space(6))
 
   Config { id: configFile }
 
@@ -50,12 +63,12 @@ Item {
     zones: Model.zonesToProbe(root.config)
   }
 
-  // Minute precision is all the display needs; seconds are opt-in because
-  // ticking every second wakes the whole shell sixty times as often for a
-  // readout nobody reads that closely.
+  // Seconds are opt-in per clock, so the tick only drops to per-second when
+  // something on the bar is actually displaying them — otherwise this wakes
+  // the whole shell sixty times as often to redraw an identical minute.
   SystemClock {
     id: clock
-    precision: root.config && root.config.showSeconds ? SystemClock.Seconds : SystemClock.Minutes
+    precision: Model.anyShowsSeconds(root.config) ? SystemClock.Seconds : SystemClock.Minutes
     onDateChanged: {
       root.nowMs = date.getTime()
       // Offsets only move at a transition, and transitions land on the hour.
@@ -117,7 +130,7 @@ Item {
       // step down the scale — present for identification, not competing with
       // the time for the glance.
       font.family: Style.font.family
-      font.pixelSize: Style.font.caption
+      font.pixelSize: root.labelFontSize
       // Held back from the time it captions, but only once: a dimmed clock is
       // already carrying the muted tint, and compounding the two put its label
       // under the legibility floor.
@@ -129,7 +142,7 @@ Item {
       text: entry.clock.time
       color: entry.tint
       font.family: Style.font.family
-      font.pixelSize: Style.font.body
+      font.pixelSize: root.timeFontSize
     }
 
     Text {
@@ -142,7 +155,7 @@ Item {
       text: entry.clock.marker
       color: entry.tint
       font.family: Style.font.family
-      font.pixelSize: Style.font.caption
+      font.pixelSize: root.labelFontSize
       opacity: 0.7
     }
   }
@@ -184,7 +197,7 @@ Item {
     // that cannot be overlapped by a long list of clocks.
     Rectangle {
       anchors { top: parent.top; left: parent.left; right: parent.right }
-      height: configFile.parseError !== "" ? 2 : 1
+      height: configFile.parseError !== "" ? root.scaled(2) : Math.max(1, root.scaled(1))
       color: configFile.parseError !== "" ? root.urgent : root.foreground
       opacity: configFile.parseError !== "" ? 0.9 : 0.12
     }
@@ -215,7 +228,7 @@ Item {
         text: root.bar.center.time
         color: root.accent
         font.family: Style.font.family
-        font.pixelSize: Style.font.body
+        font.pixelSize: root.timeFontSize
         font.bold: true
       }
 
@@ -228,7 +241,7 @@ Item {
         text: "config error"
         color: root.urgent
         font.family: Style.font.family
-        font.pixelSize: Style.font.caption
+        font.pixelSize: root.labelFontSize
       }
     }