feat(library): concept prompt library cards, toolbar and caption (#263)

* feat(library): concept toolbar and caption

The Prompt library shelf uses the shared concept toolbar (search, category,
sort, Filters): sorts are Recently added / Name A-Z / Highest rated, then
Oldest first; the Tags filter moves to "Refine this view" (D14) and Refresh
library is removed (D15), with Retry kept and re-reading failed categories.
The caption is the concept's .section-caption, "N positive prompts · M
negative variants" over the filtered set from variant_total.

Library-embedded media cards keep the favorite star working: the Library
gallery read already reports favorite (one batched lookup per page, now
covered by a test), and star answers are delivered to every mounted embedded
gallery, so a star toggles, repaints and survives a reload. The checkbox and
selection bar stay Images-only.

* feat(library): concept prompt cards with real runs and last use

The Prompt library shelf renders the concept's article.prompt-card:
.card-art (up to two previews), .card-title with a title button and the
category chip, the positive prompt block, .card-meta ("− N negative
variants", "N runs", "N images"), .tags, and .card-footer with the rating
and last-use line and the positive send plus Explore history buttons.

D23: "N runs" is the parent's run_count; the footer reads Used today /
yesterday / N days ago / <Mon D> in the viewer's local calendar days, or
"Not used yet"; stars carry a visually hidden "Rated N out of 5" and an
unrated parent shows no stars. The positive is clamped to two lines while
copy and send use the full text. Long titles wrap inside the title row
and the category chip never breaks mid-word. Card actions are named after
the prompt ("Copy positive prompt: <title>") through a new title option on
the shared prompt blocks. The production .library-card CSS is removed and
the row estimates follow the clamped card height.

The shelf error now reads "Prompt library could not be loaded. Retry."
(Refresh is gone). TESTING.md records D23, the production-only shelf copy
(D40) and the concept search placeholder kept on the Library (D41).

* test(library): concept comparison for the shelf

library-concept.spec.mjs compares the Prompt library shelf with the
immutable concept on the concept-shaped fixture: heading, toolbar,
caption, grid and the six cards (art, title row, prompt block, meta,
tags, footer) at 1600x1100 and 390x844 in both themes and motion
settings, the 3-column grid at 1800x1100, and the behaviors in both
documents (title and Explore history open history, the footer send
carries the positive only, copy toasts "Prompt copied.", the "neon"
search and the Landscapes category). A mutation test proves the
comparison notices a footer padding change and a removed variants chip.

mapLibraryConcept applies only recorded deviations: D14, D16, D23 (title
min-width, singular variant chip, spoken rating, the two-line clamp the
concept's samples exceed at 390px), D35, D36, D40 and the new D42 (tag
chips in the store's alphabetical order). Each re-laid-out part is
checked against the concept page with that deviation applied at runtime.

Corrections the comparison demonstrated:
- the fixture creates the concept's prompts last to first, so Recently
  added lists them in the concept's order;
- the shelf no longer ends with the legacy "Current prompt library"
  link; Overview's legacy cards keep it, as with "Current gallery".

The shared inventory gains the Library section, and reflow/withoutItems
move into concept-inventory.mjs for both comparison specs.

* test(workspace): reach the legacy Library from Overview, not the shelf

The shelf no longer links the legacy Library (#249 E3). The shell
destinations test now expects no legacy link on Prompt library and
asserts Overview's "Open existing prompt library" card still links
/prompt_manager/admin and that the page loads.

* feat(library): Filters shows its active count; final review follow-ups

- D44: the shared toolbar's Filters button reads "Filters · N" while N
  "Refine this view" filters are active (Library: Tags; Images: Source,
  Folder, Media, Tags), so a Browse-set Tags filter is visible on the
  shelf. The text is the accessible name. Unit and browser tests cover
  Browse -> "Filters · 1" -> Clear -> "Filters" and the Images counts.
- Renumber the alphabetical tag chips deviation D42 -> D43 (D42 is #264's).
- The caption count is a role=status region written only when it changes
  and kept shown while the shelf reloads.
- usedLabel names the year for a use in another calendar year (D23).
- prompt-blocks: same `title` option API as #264 (`subject` suffix); the
  region-name helper's parameter no longer shadows it.
- Scope library.css .row-actions rules to the history panels; fix stale
  CSS and spec comments.
- Retry re-reading a failed category list and the no-op Apply/search
  paths are covered by a browser test.
- TESTING.md: D23 amendments (year, button vs link trade-off), D44, the
  legacy Library link wording.

web/js/workspace/workspace.css

@@ -175,9 +175,9 @@ main:focus-visible { outline: 2px solid var(--ca-focus); outline-offset: 4px; }
     .image-workspace { grid-template-columns: minmax(0, 1fr); }
 }
 .options-status { font-size: 12px; padding-inline: 4px; }
-/* Until their pages rebuild (PR E Library, PR F history): the Library's and the recorded run's prompt blocks keep
-   their spacing, the Archive negative dialog keeps `section.prompt-block`, and the shared prompt sender keeps its
-   dialog and send button. */
+/* Until their pages rebuild (PR F history): the history page's and the recorded run's prompt blocks keep their
+   spacing (on the shelf's cards `.prompt-inspector` is `display: contents`, so its margin is inert there), the Archive
+   negative dialog keeps `section.prompt-block`, and the shared prompt sender keeps its dialog and send button. */
 .prompt-inspector { margin-block-start: 22px; min-inline-size: 0; }
 .prompt-block { border-block-start: 1px solid var(--ca-line); padding-block: 13px; min-inline-size: 0; }
 .prompt-negative { --prompt-role: #ff8c98; }
@@ -207,3 +207,18 @@ pre.prompt-text { font: inherit; font-size: 12px; line-height: 1.75; white-space
 @media (max-width: 780px) {
     .prompt-sender-options { grid-template-columns: minmax(0, 1fr); }
 }
+
+/* Prompt library cards (#249 PR E): the concept's `article.prompt-card` (s653–708) with real prompts, titles and media. */
+/* #249 D23: real prompts are far longer than the concept's samples, so the card clamps the positive to two lines; copy
+   and send keep the full text, and history shows all of it. */
+.prompt-card .prompt-text { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; line-clamp: 2; overflow: hidden; /* D23 */ }
+/* #249 D23: the prompt blocks' mount point is transparent, so the section sits in `.card-content` as the concept's does. */
+.card-content > .prompt-inspector { display: contents; /* D23 */ }
+/* #249 D23: a real title can be long or one unbroken word; it wraps inside the title row (the toolkit's buttons never
+   wrap), while the category chip keeps whole words beside it and wraps only a name wider than its share of the row. */
+.card-title button { min-width: 0; white-space: normal; overflow-wrap: anywhere; /* D23 */ }
+.card-title .chip { flex-shrink: 0; max-width: 60%; overflow-wrap: anywhere; /* D23 */ }
+.prompt-card .tags .chip { max-width: 100%; overflow-wrap: anywhere; /* D23 */ }
+/* #249 D23: a parent with one preview, or none, fills the art row instead of leaving the concept's second cell empty. */
+.prompt-card .card-art > :only-child { grid-column: 1 / -1; /* D23 */ }
+.prompt-card .card-art > .small { display: grid; place-content: center; min-width: 0; color: var(--ca-muted); /* D23 */ }