Overhaul bottom bar: batch add, custom fields, stat block viewer

Unify the action bar into a single search input with inline bestiary
dropdown. Clicking a dropdown entry queues it with +/- count controls
and a confirm button; Enter or confirm adds N copies to combat.

When no bestiary match exists, optional Init/AC/MaxHP fields appear
for custom creatures. The eye icon opens a separate search dropdown
to preview stat blocks without leaving the add flow.

Fix batch-add bug where only the last creature got a creatureId by
using store.save() instead of setEncounter() in addFromBestiary.
Prevent dropdown buttons from stealing input focus so Enter confirms
the queued batch.

Remove the now-redundant BestiarySearch component.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

specs/036-bottombar-overhaul/data-model.md

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+# Data Model: Bottom Bar Overhaul
+
+## Existing Domain Entities (no changes)
+
+### Combatant
+
+Already supports all fields needed for custom creature input:
+
+| Field | Type | Notes |
+|-------|------|-------|
+| id | CombatantId (branded string) | Auto-generated (c-1, c-2, ...) |
+| name | string | Required, non-empty |
+| initiative | number? | Optional — new: settable at add time for custom creatures |
+| maxHp | number? | Optional — new: settable at add time for custom creatures |
+| currentHp | number? | Optional — set equal to maxHp when provided |
+| ac | number? | Optional — new: settable at add time for custom creatures |
+| conditions | readonly ConditionId[]? | Not relevant to this feature |
+| isConcentrating | boolean? | Not relevant to this feature |
+| creatureId | CreatureId? | Set for bestiary creatures, absent for custom |
+
+### SearchResult (BestiaryIndexEntry)
+
+| Field | Type | Notes |
+|-------|------|-------|
+| name | string | Creature name |
+| source | string | Source code (e.g., "srd") |
+| sourceDisplayName | string | Display name of sourcebook |
+| ac | number | Armor class |
+| hp | number | Average HP |
+| dex | number | Dexterity score |
+| cr | string | Challenge rating |
+| size | string | Size category |
+| type | string | Creature type |
+
+## New UI-Only State (ephemeral, not persisted)
+
+### QueuedCreature
+
+Transient state held in the action bar component representing a bestiary creature selected for batch-add.
+
+| Field | Type | Notes |
+|-------|------|-------|
+| result | SearchResult | The bestiary entry to add |
+| count | number | Number of copies to add (starts at 1, increments on re-click) |
+
+**Lifecycle**: Created on first click of a dropdown entry. Incremented on re-click of same entry. Replaced on click of different entry. Cleared on confirm, Escape, or when the queued creature leaves search results.
+
+### CustomCreatureFields
+
+Transient state held in the action bar component for optional fields shown when no bestiary match exists.
+
+| Field | Type | Notes |
+|-------|------|-------|
+| initiative | string | Raw input (parsed to number on submit, empty = omit) |
+| ac | string | Raw input (parsed to number on submit, empty = omit) |
+| maxHp | string | Raw input (parsed to number on submit, empty = omit) |
+
+**Lifecycle**: Visible when search query yields no bestiary results. Cleared on submit or when bestiary results appear.
+
+## State Transitions
+
+```
+[Empty input]
+    → type 2+ chars with matches → [Dropdown with bestiary results]
+    → type 2+ chars without matches → [Custom creature fields visible]
+
+[Dropdown with bestiary results]
+    → click entry → [Queue: entry x1]
+    → click same entry → [Queue: entry x(N+1)]
+    → click different entry → [Queue: new entry x1]
+    → click confirm / Enter → add N copies → [Empty input]
+    → Escape → [Empty input]
+    → change query (queued creature gone from results) → [Queue cleared]
+
+[Custom creature fields visible]
+    → submit → add custom creature with optional fields → [Empty input]
+    → type changes to match bestiary → [Dropdown with bestiary results]
+```