feat(workout): complete mobile session flow

Make Workout Copilot behave like a finished phone-first session: rest/next state, progress, undo recovery, finish/export, replayable local log, and host proof controls tucked behind product states.

req: examples/001

req: local/001

req: local/003

req: local/004

req: host/002

examples/workout/templates/workout.css

@@ -5,6 +5,7 @@
     color-scheme: dark;
     --surface: #11130f;
     --surface-2: #171a14;
+    --surface-3: #202518;
     --ink: #f7f3e8;
     --muted: #aaa38f;
     --line: #35392d;
@@ -46,7 +47,8 @@
     letter-spacing: -0.01em;
   }
   button:focus-visible,
-  input:focus-visible {
+  input:focus-visible,
+  summary:focus-visible {
     outline: 3px solid var(--accent);
     outline-offset: 3px;
   }
@@ -71,6 +73,14 @@
     white-space: pre-wrap;
     font: 0.86rem/1.55 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
   }
+  summary {
+    cursor: pointer;
+    min-height: var(--tap);
+    display: flex;
+    align-items: center;
+    color: var(--muted);
+    font-weight: 850;
+  }
 }
 
 @layer composition {
@@ -83,8 +93,8 @@
   }
   .command-slate,
   .action-rail,
-  .ledger,
-  .host-boundary {
+  .finish-card,
+  .ledger {
     border: 1px solid var(--line);
     border-radius: var(--radius);
     background: rgb(23 26 20 / 0.92);
@@ -94,7 +104,7 @@
 
 @layer blocks {
   .command-slate {
-    min-height: 42svh;
+    min-height: 44svh;
     padding: clamp(1.2rem, 8vw, 2.3rem);
     display: flex;
     flex-direction: column;
@@ -112,13 +122,26 @@
     font-size: 0.78rem;
     font-weight: 900;
   }
+  .progress-pill {
+    width: max-content;
+    max-width: 100%;
+    border: 1px solid rgb(215 255 79 / 0.38);
+    border-radius: 999px;
+    padding: 0.45rem 0.75rem;
+    color: var(--accent);
+    background: rgb(215 255 79 / 0.08);
+    font-size: 0.82rem;
+    font-weight: 900;
+  }
   .command-slate h1 {
-    max-width: 12ch;
-    font-size: clamp(2.3rem, 14vw, 4.4rem);
+    max-width: 13ch;
+    font-size: clamp(2.2rem, 13vw, 4.4rem);
     line-height: 0.92;
     letter-spacing: -0.08em;
   }
-  .proofline {
+  .session-status,
+  .recovery-status,
+  .finish-card p {
     color: var(--muted);
     font-weight: 750;
   }
@@ -128,7 +151,7 @@
     z-index: 1;
     padding: 0.7rem;
     display: grid;
-    gap: 0.6rem;
+    gap: 0.65rem;
   }
   .primary-action {
     color: var(--accent-ink);
@@ -139,6 +162,11 @@
   .quiet-action {
     color: var(--muted);
   }
+  .secondary-actions {
+    display: grid;
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+    gap: 0.55rem;
+  }
   .micro-form,
   .voice-strip {
     display: grid;
@@ -156,20 +184,47 @@
     text-transform: uppercase;
     letter-spacing: 0.08em;
   }
-  .ledger,
-  .host-boundary {
+  .finish-card,
+  .ledger {
     padding: 1rem;
     display: grid;
     gap: 0.85rem;
   }
+  .finish-card {
+    background:
+      linear-gradient(135deg, rgb(255 186 82 / 0.12), transparent 20rem),
+      var(--surface-2);
+  }
+  .finish-card h2 {
+    margin-block-start: 0.2rem;
+    font-size: 1.35rem;
+    line-height: 1;
+    letter-spacing: -0.05em;
+  }
+  .share-action {
+    color: var(--accent-ink);
+    background: var(--warn);
+    border-color: var(--warn);
+  }
+  .host-proof {
+    border-top: 1px dashed var(--line);
+    padding-block-start: 0.35rem;
+  }
+  .host-proof p {
+    margin-block-end: 0.7rem;
+    font-size: 0.92rem;
+  }
+  .host-actions {
+    display: grid;
+    gap: 0.55rem;
+  }
   .section-heading {
     display: flex;
     gap: 0.75rem;
     align-items: center;
     justify-content: space-between;
   }
-  .ledger h2,
-  .host-boundary h2 {
+  .ledger h2 {
     font-size: 1rem;
     letter-spacing: -0.03em;
   }
@@ -184,17 +239,6 @@
     padding: 0.75rem 0.9rem;
     background: #0c0e0b;
   }
-  .host-boundary {
-    border-style: dashed;
-  }
-  .host-boundary p {
-    color: var(--muted);
-  }
-  .host-actions {
-    display: grid;
-    grid-template-columns: repeat(2, minmax(0, 1fr));
-    gap: 0.55rem;
-  }
 
   @media (min-width: 46rem) {
     .workout-app {
@@ -206,8 +250,8 @@
     .action-rail {
       grid-column: 1;
     }
-    .ledger,
-    .host-boundary {
+    .finish-card,
+    .ledger {
       grid-column: 2;
     }
     .action-rail {