feat(web): three-phase progress with live download % on The Floor

Replace the misleading 6-micro-step progress bar with three honest
phases (Searching -> Downloading -> Finishing). Downloading now shows
a live determinate percentage sourced from job.downloadProgress (Slice
A), with a "NN% · done/total tracks" caption when the track count is
known. Searching and Finishing stay indeterminate.

- status.ts: describeJob collapses to {label, kind}; drop step/totalSteps
  and the STAGES array.
- progress-bar.tsx: ProgressBar takes {kind, indeterminate?, percent?,
  caption?} instead of step/total/stageLabel.
- job-row.tsx: JobRow takes a `bar?: ReactNode` slot instead of
  step/total/indeterminate/stageLabel props.
- queue.tsx: builds the per-state bar + meta; downloading meta drops
  the track count (now shown in the bar). Retry button + error note
  from the retry feature preserved exactly.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/app/_ui/job-row.tsx

@@ -1,6 +1,5 @@
 import type { ReactNode } from "react";
 import type { Kind } from "./status";
-import { ProgressBar } from "./progress-bar";
 import { StatusChip } from "./status-chip";
 
 // Map the severity kind to the row's visual class (stripe/bar color).
@@ -15,23 +14,17 @@ export function JobRow({
   album,
   kind,
   label,
-  step,
-  total,
   meta,
   note,
-  indeterminate,
-  stageLabel,
+  bar,
 }: {
   artist: string;
   album: string;
   kind: Kind;
   label: string;
-  step: number;
-  total: number;
   meta?: ReactNode;
   note?: ReactNode;
-  indeterminate?: boolean;
-  stageLabel?: string;
+  bar?: ReactNode;
 }) {
   return (
     <article className={`job ${rowClass(kind)}`}>
@@ -41,11 +34,7 @@ export function JobRow({
           {album} <span className="artist">· {artist}</span>
         </h3>
         {meta ? <div className="meta">{meta}</div> : null}
-        {note ? (
-          <div className="note">{note}</div>
-        ) : kind !== "attention" ? (
-          <ProgressBar kind={kind} step={step} total={total} indeterminate={indeterminate} stageLabel={stageLabel} />
-        ) : null}
+        {note ? <div className="note">{note}</div> : kind !== "attention" ? bar : null}
       </div>
       <StatusChip kind={kind} label={label} />
     </article>