Fix history page contracts dropdown overflow (#38)

* Add comprehensive Red Team system specification

Defines the adversarial review feature for contracts that monitors work tasks
in real-time to catch quality issues, plan deviations, and standards violations.

Key components specified:
- Contract configuration (red_team_enabled, red_team_prompt)
- Red team task lifecycle and spawning logic
- makima red-team notify CLI command for supervisor alerts
- Task output subscription for real-time monitoring
- Database schema changes (contracts, tasks, notifications table)
- API endpoints for notification and status
- System prompt template for red team behavior
- Security considerations and access control

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Task completion checkpoint

* Task completion checkpoint

* Task completion checkpoint

* Fix history page contracts dropdown overflow

Replace native HTML <select> with custom dropdown component that:
- Uses max-h-[300px] with overflow-y-auto for scrollable list
- Positions with z-50 to not interfere with other elements
- Closes on click outside via mousedown event listener
- Shows chevron indicator with rotation animation
- Maintains dark theme styling with blue accents
- Highlights selected contract with visual feedback

Fixes issue where long contract lists caused page overflow
and obscured date filter inputs.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* [WIP] Heartbeat checkpoint - 2026-01-27 02:48:59 UTC

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 69 insertions, 12 deletions

diff --git a/makima/frontend/src/components/history/HistoryFilters.tsx b/makima/frontend/src/components/history/HistoryFilters.tsx
index a1a4945..3be50ad 100644
--- a/makima/frontend/src/components/history/HistoryFilters.tsx
+++ b/makima/frontend/src/components/history/HistoryFilters.tsx
@@ -1,3 +1,4 @@
+import { useState, useRef, useEffect } from "react";
 import type { ContractSummary } from "../../lib/api";
 
 interface HistoryFiltersProps {
@@ -21,23 +22,79 @@ export function HistoryFilters({
   onDateToChange,
   totalCount,
 }: HistoryFiltersProps) {
+  const [isDropdownOpen, setIsDropdownOpen] = useState(false);
+  const dropdownRef = useRef<HTMLDivElement>(null);
+
+  // Get the selected contract name for display
+  const selectedContract = contracts.find((c) => c.id === selectedContractId);
+  const displayText = selectedContract ? selectedContract.name : "All Contracts";
+
+  // Close dropdown when clicking outside
+  useEffect(() => {
+    function handleClickOutside(event: MouseEvent) {
+      if (dropdownRef.current && !dropdownRef.current.contains(event.target as Node)) {
+        setIsDropdownOpen(false);
+      }
+    }
+
+    if (isDropdownOpen) {
+      document.addEventListener("mousedown", handleClickOutside);
+      return () => document.removeEventListener("mousedown", handleClickOutside);
+    }
+  }, [isDropdownOpen]);
+
+  const handleSelect = (contractId: string | null) => {
+    onContractChange(contractId);
+    setIsDropdownOpen(false);
+  };
+
   return (
     <div className="shrink-0 flex items-center gap-4 p-3 border border-[rgba(117,170,252,0.15)] bg-[rgba(0,0,0,0.2)]">
       {/* Contract filter */}
       <div className="flex items-center gap-2">
         <label className="font-mono text-[10px] text-[#7788aa] uppercase">Contract</label>
-        <select
-          value={selectedContractId || ""}
-          onChange={(e) => onContractChange(e.target.value || null)}
-          className="font-mono text-xs text-[#9bc3ff] bg-[#0a1525] border border-[rgba(117,170,252,0.25)] px-2 py-1 focus:border-[#3f6fb3] focus:outline-none min-w-[150px]"
-        >
-          <option value="">All Contracts</option>
-          {contracts.map((contract) => (
-            <option key={contract.id} value={contract.id}>
-              {contract.name}
-            </option>
-          ))}
-        </select>
+        <div className="relative" ref={dropdownRef}>
+          <button
+            type="button"
+            onClick={() => setIsDropdownOpen(!isDropdownOpen)}
+            className="font-mono text-xs text-[#9bc3ff] bg-[#0a1525] border border-[rgba(117,170,252,0.25)] px-2 py-1 focus:border-[#3f6fb3] focus:outline-none min-w-[150px] text-left flex items-center justify-between gap-2"
+          >
+            <span className="truncate">{displayText}</span>
+            <svg
+              className={`w-3 h-3 transition-transform ${isDropdownOpen ? "rotate-180" : ""}`}
+              fill="none"
+              stroke="currentColor"
+              viewBox="0 0 24 24"
+            >
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
+            </svg>
+          </button>
+          {isDropdownOpen && (
+            <div className="absolute top-full left-0 mt-1 min-w-[200px] max-h-[300px] overflow-y-auto bg-[#0a1525] border border-[rgba(117,170,252,0.25)] z-50 shadow-lg">
+              <button
+                type="button"
+                onClick={() => handleSelect(null)}
+                className={`w-full text-left font-mono text-xs px-2 py-1.5 hover:bg-[rgba(117,170,252,0.1)] transition-colors ${
+                  selectedContractId === null ? "text-[#75aafc] bg-[rgba(117,170,252,0.05)]" : "text-[#9bc3ff]"
+                }`}
+              >
+                All Contracts
+              </button>
+              {contracts.map((contract) => (
+                <button
+                  type="button"
+                  key={contract.id}
+                  onClick={() => handleSelect(contract.id)}
+                  className={`w-full text-left font-mono text-xs px-2 py-1.5 hover:bg-[rgba(117,170,252,0.1)] transition-colors ${
+                    selectedContractId === contract.id ? "text-[#75aafc] bg-[rgba(117,170,252,0.05)]" : "text-[#9bc3ff]"
+                  }`}
+                >
+                  {contract.name}
+                </button>
+              ))}
+            </div>
+          )}
+        </div>
       </div>
 
       {/* Date range */}