fix(dashboard): label skill output controls - #7435

Changes

• expose the skill-output collapse state with aria-expanded and aria-controls
• give the clear action a reliable translated accessible name
• name each dismiss action with its skill
• cover collapse, clear, and per-output dismiss behavior

Inventory findings: F-110fdf3a4f4c0aa8, F-fe80d60ec26cc343, F-b5872c206ace18fc

Verification

• corepack pnpm@10.33.0 --dir crates/librefang-api/dashboard exec vitest run src/components/ui/SkillOutputPanel.test.tsx --reporter=dot (3 passed)
• corepack pnpm@10.33.0 --dir crates/librefang-api/dashboard typecheck
• corepack pnpm@10.33.0 --dir crates/librefang-api/dashboard lint
• corepack pnpm@10.33.0 --dir crates/librefang-api/dashboard test -- --reporter=dot (102 files, 1078 tests passed)
• corepack pnpm@10.33.0 --dir crates/librefang-api/dashboard build
• git diff --check

Out of scope

• skill-output store behavior and retention limits
• panel placement, styling, and responsive layout
• broader dashboard icon semantics