Accessor: Re-link modal selector labels and fix radiogroup semantics

[kunkunGames]

What changed:

• Added id prop to EmojiPicker and passed it down to the underlying toggle button.
• Updated AgentFormModal.tsx and DepartmentFormModal.tsx to use htmlFor pointing to the newly injected EmojiPicker IDs.
• Converted an invalid <label id="dept-theme-color-label"> to a <div> inside a role="radiogroup" inside DepartmentFormModal.tsx.

Why:

• Improves dashboard accessibility by correctly tying native HTML text labels to interactive, custom-built component triggers, ensuring screen reader focus and proper announcement behavior.
• Resolves an ARIA invalidity issue where a <label> was erroneously used to label a radiogroup wrapper instead of an explicit input/control.

WorkFingerprint:

• Agent: Accessor
• Boundary: dashboard/src/components/agent-manager/**
• Invariant: Layout dimensions are kept stable and accessibility improvements preserve expected keyboard behaviors and functional contracts. No backend impacts.
• Duplicate check: Fetched existing remote branches; prior PRs dealing with this were either stale broad branches or unmerged fragments (♿ Accessor: improve agent and department form modal accessibility #196, ♿ Accessor: improve AgentFormModal sprite selector accessibility #202 equivalents). Recreated cleanly onto main.

Verification:

• git diff --check run successfully.
• ./scripts/verify-dashboard.sh run successfully with passing UI tests (e.g., vitest run).
• Checked that tests for modal accessibility components passed.

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PR created automatically by Jules for task 8587043447853082141 started by @kunkunGames

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