gogcli 0.4.0

Added

• Resilience: automatic retries + circuit breaker for Google API calls (429/5xx).
• Gmail: batch ops + settings commands (autoforward, delegates, filters, forwarding, send-as, vacation).
• Gmail: gog gmail thread --download --out-dir ... for saving thread attachments to a specific directory.
• Calendar: colors, conflicts, search, multi-timezone time.
• Sheets: read/write/update/append/clear + create spreadsheets.
• Sheets: copy spreadsheets via Drive (gog sheets copy ...).
• Drive: gog drive download --format ... for Google Docs exports (e.g. Sheets to PDF/XLSX, Docs to PDF/DOCX/TXT, Slides to PDF/PPTX).
• Drive: copy files (gog drive copy ...).
• Docs/Slides/Sheets: dedicated export commands (gog docs export, gog slides export, gog sheets export).
• Docs: create/copy (gog docs create, gog docs copy) and print plain text (gog docs cat).
• Slides: create/copy (gog slides create, gog slides copy).
• Auth: browser-based accounts manager (gog auth manage).
• DX: shell completion (gog completion ...) and --verbose logging.

Fixed

• Gmail: gog gmail attachment download now works reliably; avoid re-fetching payload for filename inference and accept padded base64 responses.
• Gmail: gog gmail thread --download now saves attachments to the current directory by default and creates missing output directories.
• Sheets: avoid flag collision with global --json; values input flag is now --values-json for sheets update|append.

Changed

• Internal: reduce duplicate code for Drive-backed exports and tabular/paging output; embed auth UI templates as HTML assets.