release: harden local data handling for iTime 0.2.9

[lingcang728]

iTime 0.2.9

This PR packages the repository-wide audit fixes into the next patch release and also closes the larger architecture issues identified during the audit.

Reliability and safety

• Fail closed when the recording setting cannot be loaded. First-run behavior is unchanged, while corrupt/unreadable settings start paused.
• Keep 90/365-day retention windows exact instead of retaining one extra calendar day.
• Propagate directory enumeration errors instead of silently reporting incomplete local-data results.
• Neutralize spreadsheet formula prefixes in CSV exports while preserving raw JSON values.

Architecture and performance

• Stream full-history JSON/CSV exports directly to a temporary file and atomically promote the finished export, avoiding a second full in-memory export buffer and keeping record traversal bounded.
• Lazy-load secondary Vue pages so the initial bundle is split instead of carrying every page in the main chunk.
• Keep keyboard records on the canonical LOCALAPPDATA/iTime/Data path. If that path is unavailable, startup fails safely instead of silently writing keyboard data to the system temp directory.
• Make exit quiescing recoverable: pause collection without changing the saved preference, flush keyboard data, restore collection if flushing fails, and only exit after the local data boundary is safe.

Release readiness

• Bump all application version sources to 0.2.9: package.json, package-lock.json, Cargo.toml, Cargo.lock, and tauri.conf.json.
• Add regression coverage for retention boundaries, streaming record traversal, export cleanup/counts, CSV formula safety, and recording-startup failure behavior.

After merge, tagging the merge commit as v0.2.9 will use the existing Immutable Release workflow to build and publish the portable EXE, NSIS installer, and latest.json from a clean Windows checkout.

Validation

Windows CI is the executable gate for this PR. I will keep the branch open until the final head passes the full repository verification suite.

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