dcdpr / jp / 25955030295

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chore(tools): Validate path before format arguments in `fs_create_file` (#641)

Path validation (absolute path, component length, component count) was
previously skipped during the format-arguments phase, meaning invalid
paths could pass through undetected until actual execution. The checks
are now hoisted above the `is_format_arguments` branch so they apply
consistently in both phases.

The "Created file" preview message was also corrected to "Creating file"
to better reflect that the format phase is showing intent, not reporting
a completed action.

A test covering the absolute-path rejection during the format phase was
added to guard against regressions.

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Signed-off-by: Jean Mertz <git@jeanmertz.com>

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