Host detail page + pipeline timeline

Click a tile to open /hosts/{id} — the canonical control surface per
host. Timeline renders every pre-stage, stage, and terminal node in
order, with the current one pulsing, failed ones flagged, and
downstream ones dimmed as skipped. Detail page shows summary, hold
card (when holding), all action buttons, spec diffs, a full-height
log pane, and a collapsed expected-spec YAML.

Tile slims to name, last-seen, status, and one primary action; a
CSS-overlay <a> makes the whole card clickable while buttons stay
receptive via z-index.

Runner.publishTileUpdate now also emits pipeline-{runID} fragments,
and CompleteStage wraps Stages.CompleteByName so stage completions
advance the timeline live — without this the dots only moved on
state transitions.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/web/templates/layout_templ.go

@@ -36,7 +36,7 @@ func Layout(title string) templ.Component {
 		var templ_7745c5c3_Var2 string
 		templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.JoinStringErrs(title)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `layout.templ`, Line: 9, Col: 17}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `internal/web/templates/layout.templ`, Line: 9, Col: 17}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var2))
 		if templ_7745c5c3_Err != nil {
@@ -86,7 +86,7 @@ func BareLayout(title string) templ.Component {
 		var templ_7745c5c3_Var4 string
 		templ_7745c5c3_Var4, templ_7745c5c3_Err = templ.JoinStringErrs(title)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `layout.templ`, Line: 38, Col: 17}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `internal/web/templates/layout.templ`, Line: 38, Col: 17}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var4))
 		if templ_7745c5c3_Err != nil {