Enable editing original copyright & license (BL-16859)

[hatton]

Problem

When a book is a derivative, Bloom generates a sentence on the credits page about the original book's copyright and license, and the user cannot change it. Some publishers need different wording, and until now there was no way to get it.

Fix

A padlock now sits at the top right of that sentence's hint bubble, titled "Unlock to edit". Clicking it turns the sentence into an ordinary editable field, with the caret at the start of it, holding the wording Bloom had generated. From then on Bloom shows what the user typed instead of generating the sentence.

• The unlock is spent on one rendering. The editable shape exists only in the throwaway copy of the page built for the editor, never in the book. Refreshing, leaving the page, and clicking the open padlock therefore all arrive back at the read-only state by the same route, keeping the user's words. Three call sites enforce it: the page saved back into the book, the page sent to the editor, and the whole-book update.
• The book stays a derivative. originalCopyright, originalLicenseUrl and originalLicenseNotes are untouched, so the License tab, publishing and upload behave exactly as before.
• Storage. The user's wording lives in the data div under originalCopyrightAndLicense, and a new meta.json flag, user-edits-original-copyright-notice, says Bloom is no longer generating the sentence. Seeding replaces the <cite data-book="originalTitle"> around the original title with an <em>, so no data-book field ends up nested inside another.
• Hint bubbles gain a general affordance. data-link-icon puts an icon in a bubble's top right corner, data-link-target says what clicking it does, and data-link-icon-tooltip gives it a title. A bubble containing a link now stays open long enough for the pointer to reach it.
• Publishing. The two epub selectors that identify the sentence accept either shape, since a book can be saved in either.

Ref: https://issues.bloomlibrary.org/youtrack/issue/BL-16859

Devin review

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This change is 

[hatton]

[Devin] Bug: Empty notice cannot be edited again

If the user unlocks the sentence, deletes all of it, and leaves the page, the line is gone — and so is the padlock, because the bubble only appears where there is a sentence. Bloom no longer generates the sentence for this book, so there is nothing left to click and no way back to it from the credits page.

Deleting the text is a plausible way to say "I don't want this line", so the disappearance may be exactly right. What is missing is a way to change one's mind.

Left open for a decision: keep it as it is (deleting is final for that book), or keep the padlock on the empty spot so an empty notice can be reopened — which needs the bubble to be reachable on a div with no text in it.

[hatton]

[Claude Opus 5 from Hatton's machine during preflight] Consulted Devin on 2026-09-10, most recently at c17af2339f3d6db8cd78642c68edf82614ab42aa.

Two bugs across the branch, both non-severe, and no informational flags:

• Original copyright appears twice — fixed in 3c5560f and now marked resolved by Devin; thread Enable editing original copyright & license (BL-16859) #8346 (comment)
• Empty notice cannot be edited again — went to the developer as a decision; thread Enable editing original copyright & license (BL-16859) #8346 (comment) is deliberately left open until that answer comes back.

Two later re-reviews, the most recent at the current head, raised nothing new. CI (pr-automation) passes on this commit.