Accessor: Add id prop to EmojiPicker and connect labels

[kunkunGames]

What changed:
Added an id prop to the custom <EmojiPicker> component interface and passed it down to the underlying trigger <button>. Added htmlFor properties to the "Emoji" and "Icon" labels in AgentFormModal and DepartmentFormModal, connecting them to the picker via the new id prop.

Why:
To improve dashboard accessibility. Screen readers can now properly announce the input context for the emoji/icon picker, and clicking the label will correctly set focus on the picker button, adhering to the repository's htmlFor connectivity guidelines.

WorkFingerprint:

• Agent: Accessor
• Category Boundary: dashboard/src/**
• Primary Files: dashboard/src/components/agent-manager/EmojiPicker.tsx, dashboard/src/components/agent-manager/AgentFormModal.tsx, dashboard/src/components/agent-manager/DepartmentFormModal.tsx
• Invariant Protected: Keyboard behavior and accessible label connectivity (htmlFor).
• Public API Impact: None
• Docs Impact: None
• Verification Plan: Run ./scripts/verify-dashboard.sh and npm run test for EmojiPicker tests.

Duplicate/Overlap Check:
Ran git fetch --all && git branch -a and verified there are no overlapping open PRs specifically addressing this isolated htmlFor and id mapping for the EmojiPicker. Previous PRs attempting modal accessibility either addressed different selectors or were closed due to branch contamination (e.g., #196, #202).

Verification Commands & Results:

• ./scripts/verify-dashboard.sh: Passed (318 tests passed across 51 files, vite build successful).
• cd dashboard && npm test -- src/components/agent-manager/EmojiPicker.test.tsx: Passed (3 tests passed).

Skipped Checks:

• gh CLI was unavailable for PR inspection, so git fetch --all && git branch -a was used as a fallback.
• cargo check and npm run test:policies were skipped as the boundary is strictly dashboard/src/**.

Risk & Rollback Notes:
Risk is extremely low. These are pure React prop additions and HTML attribute insertions (id, htmlFor). If regressions occur, rolling back the PR will cleanly revert the attributes without affecting state management.

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PR created automatically by Jules for task 1031976523699749218 started by @kunkunGames

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