Fix Debrid-Link key rotation cascade failure, case-sensitive rename, and sample filter

- notDebrid (host-level) no longer burns all keys: stops rotation immediately
  with 5min cooldown instead of cycling through all 9 keys pointlessly
- Remove double provider-blockade: debrid_link_cooldown no longer stacks
  recordProviderFailure + applyProviderBusyBackoff on top of key cooldowns
- Detect timeout cascades: 2+ consecutive transport failures trigger 3min
  cooldown instead of burning remaining keys
- Case-sensitive rename: files with different casing (e.g. lowercase scene
  names) now get properly renamed instead of being skipped as "already matching"
- Extended sample filter: detect -s.mkv suffix and \Sample\ subdirectories
  in auto-rename (already worked in MKV-move)
- Add key status display with state pills in Debrid-Link key stats popup
- Add parseDebridLinkTerminalFailure for fast-fail on exhausted keys

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/renderer/styles.css

@@ -1562,10 +1562,12 @@ body,
 
 .account-subkey-table-head .col-usage,
 .account-subkey-table-head .col-limit,
+.account-subkey-table-head .col-status,
 .account-subkey-table-head .col-traffic,
 .account-subkey-table-head .col-links,
 .account-subkey-table-row .col-usage,
 .account-subkey-table-row .col-limit,
+.account-subkey-table-row .col-status,
 .account-subkey-table-row .col-traffic,
 .account-subkey-table-row .col-links {
   text-align: right;
@@ -1615,6 +1617,10 @@ body,
   color: var(--muted);
 }
 
+.account-subkey-table-row .col-status {
+  text-align: center;
+}
+
 .account-subkey-table-row .col-traffic,
 .account-subkey-table-row .col-links {
   text-align: center;
@@ -1630,10 +1636,42 @@ body,
   gap: 6px;
 }
 
-.account-subkey-table-row .col-action .btn {
-  padding: 1px 6px;
-  font-size: 10px;
-}
+.account-subkey-table-row .col-action .btn {
+  padding: 1px 6px;
+  font-size: 10px;
+}
+
+.status-pill {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 88px;
+  padding: 2px 8px;
+  border-radius: 999px;
+  font-size: 10px;
+  font-weight: 600;
+  letter-spacing: 0.02em;
+}
+
+.status-pill-ok {
+  color: #166534;
+  background: color-mix(in srgb, #22c55e 16%, transparent);
+}
+
+.status-pill-warn {
+  color: #92400e;
+  background: color-mix(in srgb, #f59e0b 18%, transparent);
+}
+
+.status-pill-bad {
+  color: #991b1b;
+  background: color-mix(in srgb, #ef4444 14%, transparent);
+}
+
+.status-pill-muted {
+  color: var(--muted);
+  background: color-mix(in srgb, var(--field) 80%, transparent);
+}
 
 .btn-sm {
   padding: 3px 8px;