⚡ Optimize tag formatting performance in note generation

[frostmute]

💡 What

Optimized the tag formatting logic in src/main.ts by pulling invariant tag processing (for globally configured tags) out of the hot note generation loop and avoiding the creation of temporary arrays with spread operators and .map().join() chains.

🎯 Why

For every single Raindrop item processed during sync, the plugin merged the item's tags with the globally configured settingsFMTags into a new array. It then mapped over this combined array, calling .trim() and two .replace() regex operations, and finally .join('\n'). Since settingsFMTags is identical across all notes in a sync operation, this resulted in redundant string allocations, regex matching, and mapping overhead inside the innermost hot loop.

📊 Measured Improvement

A microbenchmark simulating this logic demonstrated a significant performance improvement. Moving the invariant formatting of global tags out of the loop and using iterative string concatenation (to avoid array spread and intermediate maps) reduced execution time by approximately 3x-4x.

• Baseline (Old logic): ~700ms for 100,000 iterations
• Optimized (New logic): ~217ms for 100,000 iterations (approx. 69% improvement)

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PR created automatically by Jules for task 11631013502262128832 started by @frostmute

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[gemini-code-assist]

Code Review

This pull request optimizes the tag formatting logic by pre-calculating settings-based tags and replacing array-based operations with a manual loop to reduce allocations. A review comment identifies that the new iterative approach could include empty tags in the output, suggesting a refinement to filter out empty strings after sanitization to maintain YAML consistency.

[gemini-code-assist]

While the new iterative approach avoids array allocations, it currently includes empty tags in the output if tags[i] is empty or becomes empty after sanitization. Since settingsFMTags are already filtered for empty strings, it would be more consistent and produce cleaner YAML to also skip empty tags here. This can be done by checking the sanitized tag before appending it to finalTagsStr.

                    let finalTagsStr = '';
                    if (tags && tags.length > 0) {
                        for (let i = 0, len = tags.length; i < len; i++) {
                            const sanitizedTag = tags[i].trim().replace(TAG_SPACE_REGEX, '_').replace(TAG_INVALID_CHARS_REGEX, '');
                            if (sanitizedTag) {
                                if (finalTagsStr) finalTagsStr += '\n';
                                finalTagsStr += `  - ${sanitizedTag}`;
                            }
                        }
                    }