feat: confirm a saved quotation with a short note

SPEC.md

@@ -87,7 +87,7 @@ The v1 client presents one reader screen:
 - Subscribed sites are checked once in the background at launch, and whenever the reader asks. Sites are checked one after another rather than at once, and a site that cannot be reached keeps the posts already held and is still recorded as checked, so one site being down never stops the rest.
 - A fresh install comes with the project's directory of sites already bookmarked, so a first session has somewhere to go. It is a bookmark like any other: removing it is the reader's own, and no later start gives it back.
 - The reader can tag bookmarks and sites. A tag exists only while something carries it, so adding a tag and making one are the same act; `mews:tags` lists every tag in use and what carries it, and following a tag narrows the list it belongs to. There is no renaming and no empty tag.
-- The reader can keep marked text as a quotation. Marking text on a page offers, in the selection toolbar, to save it; the kept text is stored with the page it came from, with the author when the page's metadata named one, and with the site's title when the reader's subscriptions know the site the page belongs to. `mews:quotations` lists what is kept, one row per quotation naming the author, the article's title and the site it came from — by its own title when the reader's subscriptions know it, by its host otherwise — with the day it was kept, ordered by that day or by the page it came from, narrowed by a search over the text, the author, the page's title and its address. A row shares its quotation through the system share sheet, together with a citation shaped as APA names a web page: the author first when the page carried one, otherwise the article's title; the year as a no-date marker, since a page declares no date; then the article's title, the site's own title (its host when the subscriptions do not know it), and the address. A row can remove its quotation, and nothing else is offered, since the citation is the record of where the words came from.
+- The reader can keep marked text as a quotation. Marking text on a page offers, in the selection toolbar, to save it, and a short note confirms the save, since closing the toolbar looks the same either way; the kept text is stored with the page it came from, with the author when the page's metadata named one, and with the site's title when the reader's subscriptions know the site the page belongs to. `mews:quotations` lists what is kept, one row per quotation naming the author, the article's title and the site it came from — by its own title when the reader's subscriptions know it, by its host otherwise — with the day it was kept, ordered by that day or by the page it came from, narrowed by a search over the text, the author, the page's title and its address. A row shares its quotation through the system share sheet, together with a citation shaped as APA names a web page: the author first when the page carried one, otherwise the article's title; the year as a no-date marker, since a page declares no date; then the article's title, the site's own title (its host when the subscriptions do not know it), and the address. A row can remove its quotation, and nothing else is offered, since the citation is the record of where the words came from.
 - Each library page carries a search box that narrows it by title or address as the reader types, a quarter second after they stop. The query rides in the address as any other view state does, but it replaces the step of the walk they are standing on rather than adding one, so a search of eight letters is one step back and not eight; the box keeps what they typed as the page rebuilds under them, and follows the page when the page sets it, as clearing the search does. Submitting the box still works, for a reader who would rather say when to search. Each row carries its own actions: remove a bookmark, leave a site or check it now, forget a page. History lists one row per address, headed by the most recent visit, rather than repeating a page once per visit. Clearing history takes a second step on a page the reader can simply leave, since it cannot be undone.
 - A change is a link too: following `mews:do/<verb>` applies it and rerenders the page in place without adding a history entry. Only a link followed from one of the client's own pages is honored, so a fetched page cannot clear history or change a setting on the reader's behalf (spec 8.1). A form on one of these pages is routed the same way rather than sent to the network.
 - Our own pages are built from the same blocks as a page but are interface, not an article, so the renderer lays them out differently: wider before they stop growing, denser, rows divided by a line instead of bulleted, section headings quieter, a note under a row set smaller and dimmer, links carried by weight rather than an underline, and a one-field form on a single line.