DeepSeek 公式粘贴净化器（剪贴板）

修复「从 DeepSeek / KaTeX / MathJax 网页复制回答，粘进 Obsidian 后公式乱掉」的问题。 Symptoms this skill fixes: · formulas appear TWICE with no spaces (e.g. "15x+8y=4000015x+8y=40000") · formulas render as raw text, not as math · $...$ / $$...$$ delimiters never make it into the clipboard · UI buttons / icons ("复制", "ds-icon") leak into the pasted note · fractions collapse into bare digits — "\frac{9}{7}" pastes as "79", because numerator and denominator are stacked spans and read linearly · subscripts / superscripts / roots disappear, formulas get linearised Root cause: browsers put BOTH the katex-mathml layer (with the TeX source in <annotation encoding="application/x-tex">) and the duplicate katex-html visual layer onto the clipboard, and the delimiters only ever existed inside that annotation attribute — never in any text node. Worse: when you SELECT (drag over) a formula instead of using the page's copy button, the katex-mathml layer is CSS-clipped to 1px and falls outside the selection, so the clipboard HTML carries NO annotation at all — only the visual layer. The TeX source then has to be reconstructed from KaTeX's layout geometry (which span sits above the fraction line, etc.). Fix: a resident clipboard watcher (pure Python stdlib + ctypes Win32) that rewrites the clipboard ~0.25 s after Ctrl+C. It extracts TeX from the annotation when present; when the annotation is missing it reverses the katex-html visual layer back into LaTeX (\frac, ^/_ , \sqrt, cases, pmatrix, \binom, \vec …); then wraps it as $...$ / $$...$$, drops the duplicate layer, and clears the HTML format so the editor takes the plain-text path. Guarded: if no KaTeX is detected, NOT A SINGLE BYTE of the clipboard is touched (so pasting "$100 and $200" is safe). Triggers: 剪贴板净化, 复制粘贴格式乱, 公式重复两遍, 公式不渲染, DeepSeek 复制到 Obsidian, 复制过去格式有问题, KaTeX 乱码, clipboard cleaner, paste from web page into Obsidian broken, math formula duplicated on paste, delimiter missing.

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