docs: update TODO — toast/modal + dropdown filter done

TODO.md

@@ -4,17 +4,9 @@ Backlog of bugs + long-term items. Milestones live in REWORK_PLAN.md.
 
 ## Open
 
-### BUG: add participants duplication alert disappears fast
-- Duplicate-add throws alert but toast vanishes before user reads.
-- Fix: extend toast duration OR require manual dismiss.
-
-### FEAT: filter already-added from add-participant dropdown
-- Character list dropdown shows characters already in encounter.
-- Filter them out (or disable with strike-through).
-
 ### FEAT-2: structured combat logs (parseable)
 - Goal: logs in storage carry enough state to run skip/rotation analysis
-  on ANY historic round — not just replay stdout.
+  on ANY historic round --- not just replay stdout.
 - Current: `{timestamp, message, encounterName, undo}`. Parser guesses
   roster from message strings. Brittle.
 - Upgrade: structured fields at turn-state mutation log sites in App.js
@@ -78,6 +70,16 @@ Backlog of bugs + long-term items. Milestones live in REWORK_PLAN.md.
 - Initiative field at add-char, add-monster, edit participant.
 - Inline edit wired. Tie-break = drag order.
 
+### UI feedback: toast + info modal (DONE)
+- All 23 native alert() replaced. ToastStack (6s auto-dismiss + manual X)
+  for transient failures. InfoModal (persistent OK) for validations.
+  React context provider wraps all 3 App branches.
+- Fixed: native alert vanished instantly on browser focus loss.
+
+### Filter dup chars from add-participant dropdown (DONE)
+- Character dropdown excludes chars already in encounter. Prevents
+  dup-add at source. No more dup alert path needed.
+
 ### Test timeouts (DONE)
 - jest.setTimeout(10000) in setupTests.js (CRA blocks config-level timeout).
 
@@ -91,57 +93,57 @@ Backlog of bugs + long-term items. Milestones live in REWORK_PLAN.md.
 - FIXED (addParticipant throws on dup id).
 
 ### BUG-4: hide-player-HP breaks display view
-- FIXED — mock honors setDoc{merge}, all 5 activeDisplay sites use merge.
+- FIXED --- mock honors setDoc{merge}, all 5 activeDisplay sites use merge.
 
 ### BUG-5: mid-round addParticipant/revive corrupts rotation
-- FIXED — slot-array + DRY advance core nextActiveAfter.
+- FIXED --- slot-array + DRY advance core nextActiveAfter.
 
 ### BUG-6: reorderParticipants doesn't update turnOrderIds
 - FIXED structurally by 1-list model.
 
 ### BUG-7: reorderParticipants not logged
-- FIXED — returns log:{message, undo}. Handler calls logAction. deathSave,
+- FIXED --- returns log:{message, undo}. Handler calls logAction. deathSave,
   addParticipants, updateParticipant logging gaps also closed.
 
 ### BUG-8: server adapter has no reconnect
-- FIXED — onclose reconnects + re-subscribes existing paths.
+- FIXED --- onclose reconnects + re-subscribes existing paths.
 
 ### BUG-10: deact+reactivate same round double-acts participant
-- FIXED — 1-list model keeps slot position on toggle. Reactivate does not
+- FIXED --- 1-list model keeps slot position on toggle. Reactivate does not
   grant second turn. Test: turn.bug10.test.js.
 
 ### BUG-11: FE Combat.scenario test crashes
-- FIXED — moved to shared/turn.combat.test.js, pure functions, 100 rounds.
+- FIXED --- moved to shared/turn.combat.test.js, pure functions, 100 rounds.
 
 ### BUG-12: campaign selection follows activeDisplay
 - FIXED.
 
 ### BUG-13: reorderParticipants crossing current pointer = ambiguous
-- FIXED — block cross-pointer reorder during active encounter (both dirs).
+- FIXED --- block cross-pointer reorder during active encounter (both dirs).
   Full fix needs actedThisRound tracking. Pragmatic block prevents skip/double.
   Pre-combat: free reorder. Test: turn.bug13.test.js.
 
 ### BUG-14: addParticipant init-insertion breaks after drag-reorder
-- FIXED — slotIndexForInit scans current list (post-drag aware).
+- FIXED --- slotIndexForInit scans current list (post-drag aware).
 
 ### BUG-15: DisplayView re-sorts (drag order not preserved)
-- FIXED — display renders participants[] directly.
+- FIXED --- display renders participants[] directly.
 
 ### BUG-16: subscribeCollection hook drops queryConstraints
-- FIXED — neutral builders, both adapters honor orderBy/limit.
+- FIXED --- neutral builders, both adapters honor orderBy/limit.
 
 ### BUG-17: dead SDK imports in App.js
-- FIXED — trimmed (auth + getFirestore + getStorage remain).
+- FIXED --- trimmed (auth + getFirestore + getStorage remain).
 
 ### BUG-18: stale comments reference deleted memory adapter
 - FIXED.
 
 ### FEAT-1: Dead participants stay in turn order
-- DONE — applyHpChange no longer flips isActive on death. Dead stay in
+- DONE --- applyHpChange no longer flips isActive on death. Dead stay in
   rotation, nextTurn visits them, PCs get death-save turn.
 
 ### combat.scenario 100 rounds not turns
-- DONE — loops by actual round-wrap count.
+- DONE --- loops by actual round-wrap count.
 
 ### feat: add all characters to participants list
-- DONE — addParticipants bulk add wired.
+- DONE --- addParticipants bulk add wired.