feat: add global quiet flag for CLI output

[fmueller]

Motivation

• Provide a global --quiet option so the CLI can be used in scripts/CI without progress/status noise.
• Ensure status and warning messages can be suppressed while preserving primary stdout responses (e.g., JSON payloads).
• Make verbose reporters and write-status messages respect the quiet mode consistently across commands.

Description

• Add a new src/scribae/cli_output.py utility exposing is_quiet(), echo_info() and secho_info() to gate non-essential output.
• Add a global --quiet/-q option on the root Typer app callback and store it in ctx.obj so subcommands can observe it via click.get_current_context.
• Update command modules (idea, brief, write, feedback, meta, translate) to: use is_quiet() when creating the reporter, replace direct typer.echo/typer.secho status writes with echo_info/secho_info, and suppress progress messages when quiet mode is enabled.
• Add a unit test test_quiet_flag_suppresses_status_output in tests/unit/main_test.py to assert that --quiet suppresses status output while still writing expected files.

Testing

• Ran uv run ruff check src tests and checks passed.
• Ran uv run mypy src and it reported unrelated type errors (missing torch and no-any-return in src/scribae/translate/mt.py) which are pre-existing and not introduced by this change.
• Ran uv run pytest and the full suite passed (161 passed).

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Codex Task