[westernCasa]

B87. Saved copies of trail pages: offered, never forced, kept on your computer, checked by SHA-256.

Saving (your choice: button + trail setting)

• Save a Copy of This Page: File menu, or right-click a page.
• Save a copy: on a selected page card. With no tab open, the page loads in a hidden window first.
• Keep copies: Off / On: in a trail's … menu in the switcher, off by default. When on, each page that becomes a card in that trail gets a copy.
• The page becomes a card if it wasn't one.
• Saving again when the page's text hasn't changed keeps the one copy and says so.
• Never: sign-in, account and payment pages (B66), private tabs, opened (read-only) trails.

The copy (your choice: MHTML + text)

• One MHTML file named by its SHA-256, plus its readable text beside it, in NODE's data folder.
• MHTML files differ on every save (their date and part boundaries), so "unchanged" is decided by the page's text, not the hash.
• Copy files that no trail names any more are deleted at start-up, after deleted trails are purged (B115).

On the card (your choice: card mark + send when ticked)

• "Copy · 8 Nov 10:05", plus "· 2 copies" when there are more. The SHA-256 is in its tooltip.
• Click it to open the copy in a tab. NODE checks the SHA-256 first; a copy that changed is not opened.

Sharing

• Trail files list each copy: Copy: 8 Nov 2026 10:05 · SHA-256 ….
• The copies themselves go only when Saved copies of pages is ticked in the share sheet: as files in a folder " copies" beside the trail file, linked from it (doc 26).
• Opening such a file keeps each copy whose SHA-256 matches. One that doesn't is marked changed ("· 1 changed" on the card) and never opened.

Code

• core/trail.js: addCopy, copyHashes, setKeepCopies, event copied, keepCopies in list(). core/trail-file.js: the Copy lines and the copies option.
• main.js: saveCopyOf, copyTab, copyUrl, openCopy, cleanCopies, takeCopies; channels trail:copy-save, trail:copy-open, trail:keep-copies; share save with copies; menu items.
• renderer/canvas.js, app.js, index.html, styles.css: card line, selection bar button, Keep copies chip, share sheet choice. Tokens only.

Not in this PR: the Chromium build; search past trails (B89) doesn't read the copies' text yet.

Tests

• test/copies-demo.js (npm run test:copies, in test:unit): 4 checks.
• New test/e2e/53-saved-copies.js (20 checks), in both CI e2e lists.
• Locally: test:unit, and e2e 27, 33, 36, 38, 42, 43, 44, 49, 51 and 52 still pass.

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