detect_plan_tier: re-resolve roots fresh; expose searched paths in TierInfo for diagnosis

src/components/Settings.svelte

@@ -93,6 +93,14 @@
             Approximate — Anthropic doesn't publish exact caps. Tune below
             once you actually hit a limit.
           </div>
+          {#if tier.label.startsWith("Unknown") && tier.searched.length > 0}
+            <details class="muted hint">
+              <summary>Searched paths</summary>
+              <ul class="paths">
+                {#each tier.searched as p (p)}<li><code>{p}</code></li>{/each}
+              </ul>
+            </details>
+          {/if}
         </div>
       {/if}
 
@@ -194,6 +202,9 @@
     gap: 4px;
   }
   .hint { font-size: 10px; line-height: 1.3; }
+  details summary { cursor: pointer; font-size: 10px; }
+  ul.paths { margin: 4px 0 0; padding-left: 14px; max-height: 70px; overflow: auto; }
+  ul.paths code { font-size: 10px; word-break: break-all; }
   .error {
     background: rgba(255, 107, 107, 0.15);
     border: 1px solid var(--danger);

src/types.ts

@@ -67,4 +67,5 @@ export interface TierInfo {
   tier: unknown;
   label: string;
   recommended_caps: Caps;
+  searched: string[];
 }