docs(tsdoc): harden NotificationSettings interface contracts and logic annotations

[google-labs-jules]

Generated by: .github/nightly-prompts/06-documentation-tsdoc.md

Reasoning:

[Priority Queue Item]: Item 2 (Missing Interface Contracts) and Item 3 (Inline Logic Gaps).
[Safety Checks]: Confirmed CleanStack Architecture ADR coherence, @features Layer 3 vocabulary compliance, and SPDX license header verification.
[Rationale]: Hardens the interface contract and decision comments for the recently modernized NotificationSettings component, securing 100% logic intent transparency at the feature UI boundary.

Changes:

• [Frontend-PWA/src/features/settings/components/NotificationSettings.vue]: Injected complete component-level, props-level, and computed-level JSDoc/TSDoc specifications, inline decision logs explaining the 48px mobile touch targets, and declarative haptic feedback brokering.

Verification:

• [Automated]: Ran the specialized Vitest suites for all modified files with 100% pass (1409/1409 tests passed).
• [Automated/Audit]: Confirmed zero architectural layer violations via depcruise.

Log Updates:

• Updated .github/nightly-logs/06-documentation-tsdoc-coverage.log
• Updated .github/nightly-logs/00-pr-history.md

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PR created automatically by Jules for task 9217350383746597401 started by @AlbiDR

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