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/stores/selection.svelte.ts

@@ -12,6 +12,8 @@
 const USER_PREFIX = "#/user/";
 const WORKER_PREFIX = "#/worker/";
 const ACCELERATOR_HASH = "#/accelerator";
+const STATS_HASH = "#/stats";
+const BESTSHARE_HASH = "#/bestshare";
 
 type Selection = { user: string | null; worker: string | null; page: string | null };
 
@@ -23,6 +25,12 @@ function readHash(): Selection {
   if (h === ACCELERATOR_HASH) {
     return { user: null, worker: null, page: "accelerator" };
   }
+  if (h === STATS_HASH) {
+    return { user: null, worker: null, page: "stats" };
+  }
+  if (h === BESTSHARE_HASH) {
+    return { user: null, worker: null, page: "bestshare" };
+  }
   if (h.startsWith(WORKER_PREFIX)) {
     const w = decodeURIComponent(h.slice(WORKER_PREFIX.length));
     return { user: null, worker: w || null, page: null };
@@ -57,12 +65,22 @@ export function selectAccelerator(): void {
   window.location.hash = ACCELERATOR_HASH;
 }
 
+export function selectStats(): void {
+  window.location.hash = STATS_HASH;
+}
+
+export function selectBestShare(): void {
+  window.location.hash = BESTSHARE_HASH;
+}
+
 export function clearSelection(): void {
   if (
     window.history.length > 1 &&
     (window.location.hash.startsWith(USER_PREFIX) ||
       window.location.hash.startsWith(WORKER_PREFIX) ||
-      window.location.hash === ACCELERATOR_HASH)
+      window.location.hash === ACCELERATOR_HASH ||
+      window.location.hash === STATS_HASH ||
+      window.location.hash === BESTSHARE_HASH)
   ) {
     window.history.back();
   } else {