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/checklists/requirements.md

@@ -0,0 +1,34 @@
+# Specification Quality Checklist: Bottom Bar Overhaul
+
+**Purpose**: Validate specification completeness and quality before proceeding to planning
+**Created**: 2026-03-11
+**Feature**: [spec.md](../spec.md)
+
+## Content Quality
+
+- [x] No implementation details (languages, frameworks, APIs)
+- [x] Focused on user value and business needs
+- [x] Written for non-technical stakeholders
+- [x] All mandatory sections completed
+
+## Requirement Completeness
+
+- [x] No [NEEDS CLARIFICATION] markers remain
+- [x] Requirements are testable and unambiguous
+- [x] Success criteria are measurable
+- [x] Success criteria are technology-agnostic (no implementation details)
+- [x] All acceptance scenarios are defined
+- [x] Edge cases are identified
+- [x] Scope is clearly bounded
+- [x] Dependencies and assumptions identified
+
+## Feature Readiness
+
+- [x] All functional requirements have clear acceptance criteria
+- [x] User scenarios cover primary flows
+- [x] Feature meets measurable outcomes defined in Success Criteria
+- [x] No implementation details leak into specification
+
+## Notes
+
+- All items pass validation. Spec is ready for `/speckit.clarify` or `/speckit.plan`.