Fix table parsing and auto-format reliability

[krotname]

What changed

• fixed CSV/TSV conversion for escaped pipes, malformed quoted fields, multiline current blocks, explicit empty records, surrounding spaces, and delimiter selection
• tightened Markdown table detection so Setext headings and separator/header column mismatches are not reformatted as tables
• preserved Unicode grapheme clusters while wrapping long cells and replaced per-character width shrinking with an equivalent batch algorithm
• debounced document auto-formatting, made stale timer callbacks cancellable, and guarded disposed editors/projects and unrelated VFS events
• limited Reformat Selection to intersecting tables and delegated Tab normally for multiple carets
• handled oversized Insert Table dimensions without an action crash
• expanded shared golden, editor regression, and performance coverage

Why

Several independent edge cases could corrupt converted text, misidentify prose as a table, split a grapheme cluster, trigger stale automatic formatting after a manual edit, or perform quadratic work on large documents/cells.

Impact

Table editing and conversion are safer and more predictable. Automatic formatting now coalesces rapid edits, stays scoped to active Markdown editors, and remains cancelable. The shared Java/C++ golden fixture documents the cross-plugin behavior.

Validation

• gradlew.bat check buildPlugin corePerformance --offline --no-daemon --console=plain --no-build-cache --rerun-tasks
• JaCoCo core line coverage: 90.85%
• Plugin Verifier 1.407 against IntelliJ IDEA Community 2022.3.3: Compatible; dynamic plugin eligible
• 1,000,000-character header auto-fit benchmark: 107 ms median (1,500 ms threshold)
• 50,000 pipe-heavy non-table lines scan: 23 ms median (500 ms threshold)
• shared golden fixture normalized-identical to NppMarkdownTableEditor
• secret scan and git diff --check passed

[codecov]

Codecov Report

❌ Patch coverage is 79.16667% with 25 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...krot/markdowntableidea/core/MarkdownTableCore.java	79.16%	15 Missing and 10 partials ⚠️

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