**a11y(contracts): announce updates politely (#517)**

[Awointa]

Adds a polite aria-live region that announces meaningful contracts changes (count/status) to screen-reader users when content updates.

• Debounced so rapid successive updates don't spam the announcement queue
• No announcement on initial mount
• No change to underlying contracts logic
• Tests cover: normal update, rapid successive updates, zero results, no-announce-on-mount
• npm run lint, npm test, npm run build all passing (output included below)

# paste full test/lint/build output here

Closes #517.

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[mikewheeleer]

thanks @Awointa, exactly what #517 needed. merging 🎊