Select items by clicking the card instead of copying them

Copying was a side effect of a click, which made it impossible to build
a selection with the mouse and surprising when the intent was to pick
something up rather than copy it immediately. A click now selects (or
deselects), and copying is an explicit action from the selection bar or
the right-click menu.

AGENTS.md

@@ -33,12 +33,11 @@ clicking an item copies it back to the clipboard.
   Saves on every mutation.
 - `Sources/Prompt/PanelView.swift` — the panel UI. Header (section switcher,
   search, add photos, close), item list, composer. Composer `# Name` creates/
-  switches sections. Click = copy; the row checkbox selects, Cmd+click toggles
-  multi-select, Shift+click selects a range, and a selection bar offers Copy as
-  List / Copy as Lines; right-click = context menu acting on the selection
-  (Copy, Copy as List, Copy as Lines, Done, Edit, Open, Merge, Move To,
-  Delete). Esc clears the selection before it hides the
-  panel. Drop target for images/files.
+  switches sections. Click = select (Shift+click for a range); the selection
+  bar offers Copy (single item), Copy as List and Copy as Lines; right-click =
+  context menu acting on the whole selection (Copy, Copy as List, Copy as
+  Lines, Done, Edit, Open, Merge, Move To, Delete). Esc clears the selection
+  before it hides the panel. Drop target for images/files.
 - `Sources/Prompt/PanelController.swift` — owns the floating `NSPanel`
   (`.nonactivatingPanel`, `.floating`, right-edge docked, frame autosaved as
   `PromptPanel`), the Cmd+V image-paste monitor, and `EditWindowController`
@@ -172,11 +171,13 @@ brew upgrade --cask prompt
   dispatches `paste:` to the responder chain itself for text, and adds the
   clipboard image to the store when there is no text. `Prompt --diag` dumps the
   menu so the wiring can be checked without a keyboard.
-- **A row is not a `Button`** because it contains a checkbox `Button` for
-  selecting the item, and nested buttons never receive clicks. The row uses
-  `contentShape` + `onTapGesture` for click-to-copy instead. Selection is
-  driven by the checkbox, Cmd+click (toggle) and Shift+click (range); the
-  context menu acts on the whole selection via `effectiveIDs(for:)`.
+- **A row is not a `Button`** because it contains a checkbox `Button`, and
+  nested buttons never receive clicks. The row uses `contentShape` +
+  `onTapGesture` so a click anywhere on the card selects it. Selection is
+  driven by the card click, the checkbox, Cmd+click (toggle) and Shift+click
+  (range); the context menu acts on the whole selection via `effectiveIDs(for:)`.
+  Copying is an explicit action (selection bar or context menu), never a side
+  effect of a click — that was changed deliberately.
 - **Never bind bare keys as `.keyboardShortcut` in the panel** (Space, Delete,
   plain Cmd+C). SwiftUI key equivalents are matched before text input and
   would steal characters from the composer TextField. Only Cmd-modified