Add Gemini extension (clipboard-first flow) to contrib

contrib/Gemini.popclipext/Config.json

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+{
+  "name": "Gemini",
+  "identifier": "com.gravitypoet.popclip.extension.gemini",
+  "description": "Open Gemini and copy your selected text plus custom question for quick paste.",
+  "icon": "gemini.png",
+  "title": "\u200B",
+  "popclipVersion": 4586,
+  "app": {
+    "name": "Google Gemini",
+    "link": "https://gemini.google.com/"
+  },
+  "requirements": [
+    "text"
+  ],
+  "applescriptFile": "gemini.applescript"
+}

contrib/Gemini.popclipext/Readme.md

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+# Gemini
+
+Open Gemini in Chrome and prepare a structured prompt from selected text.
+
+## What it does
+
+1. Prompts for your question after you select text.
+2. Builds this prompt format:
+
+```text
+【原文】
+<selected text>
+
+【问题】
+<your question>
+```
+
+3. Copies the full prompt to your clipboard.
+4. Opens a new `https://gemini.google.com/app` tab in Chrome.
+5. You paste with `Command+V` and press Enter.
+
+## Why manual paste
+
+Gemini web currently has inconsistent auto-submit behavior across accounts and browser automation settings. This extension uses a stable clipboard-first flow.
+
+## Requirements
+
+- Google Chrome installed
+- Logged in to Gemini web
+
+## Author
+
+- GravityPoet
+
+## Credits
+
+- Gemini icon image from Google Gemini web assets (`gstatic.com`), trademark belongs to Google.
+
+## Changelog
+
+- 2026-02-18 First release

contrib/Gemini.popclipext/gemini.applescript

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+on run
+  set selectedText to "{popclip text}"
+  if selectedText is "" then error "No selected text found." number 700
+
+  set dialogResult to display dialog "请输入你想补充问 Gemini 的问题：" default answer "" buttons {"取消", "发送"} default button "发送" cancel button "取消"
+  set userQuestion to text returned of dialogResult
+  set trimmedQuestion to my trimText(userQuestion)
+  if trimmedQuestion is "" then error "问题不能为空。" number 701
+
+  set finalPrompt to "【原文】" & return & selectedText & return & return & "【问题】" & return & userQuestion
+  set the clipboard to finalPrompt
+
+  tell application "Google Chrome"
+    activate
+    if (count of windows) is 0 then make new window
+    tell front window
+      make new tab at end of tabs with properties {URL:"https://gemini.google.com/app"}
+      set active tab index to (count of tabs)
+    end tell
+  end tell
+
+  display notification "内容已复制到剪贴板，请在 Gemini 输入框按 Command+V 后回车。" with title "Gemini Ask"
+end run
+
+on trimText(rawText)
+  set text item delimiters to {space, tab, return, linefeed}
+  set parts to text items of rawText
+  set text item delimiters to ""
+  set cleaned to parts as text
+  set text item delimiters to ""
+  return cleaned
+end trimText