Add best share analysis page, miner column, and UI improvements

- Best share page: hex + binary hash comparison against network target,
  per-bit coloring showing exactly which bits prevented a valid block,
  toggle between network diff at time of finding vs current diff
- Capture best share hash from ckpool logs with one-time backfill
- Persist network difficulty at time of best share for historical accuracy
- Add miner (worker) column to blocks table via coinbase address matching
- Truncate block hashes in table with full hash on hover
- Increase hashrate chart Y-axis to 7 ticks for better readability

ui/src/App.svelte

@@ -12,6 +12,8 @@
   import UserDetailPage from "./lib/UserDetailPage.svelte";
   import WorkerDetailPage from "./lib/WorkerDetailPage.svelte";
   import AcceleratorPage from "./lib/AcceleratorPage.svelte";
+  import StatsPage from "./lib/StatsPage.svelte";
+  import BestSharePage from "./lib/BestSharePage.svelte";
   import SharesBar from "./lib/SharesBar.svelte";
   import BlockFoundAnimation from "./lib/BlockFoundAnimation.svelte";
 
@@ -41,6 +43,18 @@
         <AcceleratorPage />
       </div>
     {/key}
+  {:else if selection.page === "stats"}
+    {#key 'stats'}
+      <div class="page-enter">
+        <StatsPage />
+      </div>
+    {/key}
+  {:else if selection.page === "bestshare"}
+    {#key 'bestshare'}
+      <div class="page-enter">
+        <BestSharePage />
+      </div>
+    {/key}
   {:else if selection.worker}
     {#key selection.worker}
       <div class="page-enter">