Preserve spaces around template tags (#104)

[donaldevine]

Fixes #104

Problem

Spaces between template tags (or between tags and words) were dropped in the generated document. E.g. From {{a}} to {{b}} rendered as From 11-may-2025to 11-may-2026.

Cause

In OOXML, leading/trailing whitespace in a <w:t> element is stripped unless the element has xml:space="preserve". Text elements created during tag replacement were missing this attribute (which is also why non-breaking spaces were unaffected, as noted in the issue).

Fix

Set Space = SpaceProcessingModeValues.Preserve on Text elements created during replacement.

Testing

Reproduced the issue. After the fix, spaces are preserved correctly.

[gemini-code-assist]

Code Review

This pull request updates the text assignment in MiniWord.Implment.cs to use the string representation of a StringBuilder and preserves whitespace formatting. The review feedback suggests caching the StringBuilder's string representation to avoid redundant allocations and improve performance.

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