Sharpened the data source warnings and tightened the selection popovers (#971)

app/MindWork AI Studio/wwwroot/app.css

@@ -475,20 +475,59 @@ tr:has(> .provider-group-header) .mud-icon-button {
  * Rows of the tool selection which the chat and the assistants open from their footer. There will be
  * far more tools than the ones we start with, so a row must not waste height: MudBlazor's settings
  * button alone puts 12px of padding around a 24px icon, which makes a row 48px tall before the
- * switch and the frame are counted at all. Size.Small takes most of that away; the rule below takes
- * the rest, and it has to name the MudBlazor class to outweigh its specificity. Alternating rows
- * carry a grey ground, which tells a long list apart better than a separator line does and costs no
- * height at all. The colors are MudBlazor palette variables, so both grounds follow the theme.
+ * switch and the frame are counted at all. Size.Small takes most of that away; the rules below take
+ * the rest, and the second one has to name the MudBlazor class to outweigh its specificity.
  */
 .tool-selection-rows > .tool-selection-row {
     padding: 0.15rem 0.25rem;
-    border-radius: var(--mud-default-borderradius);
-}
-
-.tool-selection-rows > .tool-selection-row:nth-child(odd) {
-    background-color: var(--mud-palette-background-gray);
 }
 
 .tool-selection-row .mud-icon-button {
     padding: 0.2em;
 }
+
+/*
+ * Rows of the data source lists, in the popover next to the tool selection as well as in the
+ * settings dialog. A row carries a name and at most one icon, so there is no reason for it to be
+ * 48px tall: MudBlazor pads the item with 8px on both sides and the text slot with another 4px,
+ * which is more frame than content. Dense on the list halves the first part, the rule below takes
+ * the second one away, and it has to name the MudBlazor class to outweigh its specificity.
+ */
+.data-source-rows .mud-list-item-text {
+    margin-top: 0;
+    margin-bottom: 0;
+}
+
+/*
+ * The checkboxes MudBlazor renders into a multi-selection list come out larger than the box of the
+ * tool selection next to it, and MudList has no parameter for their size. So the three rules below
+ * state it: the 20px icon and the 4px of padding which Size.Small together with Dense produce over
+ * there, plus the 4px between the box and the name which the tool row takes from the spacing of its
+ * stack -- the list puts its checkbox outside the slot that holds our own markup, so no stack of
+ * ours reaches it. The icon needs a rule of its own because MudBlazor gives it an explicit font
+ * size, which no inherited one can outrank.
+ */
+.data-source-rows .mud-checkbox {
+    margin-inline-end: 0.25rem;
+}
+
+.data-source-rows .mud-checkbox .mud-icon-button {
+    padding: 0.25rem;
+}
+
+.data-source-rows .mud-checkbox .mud-icon-root {
+    font-size: 1.25rem;
+}
+
+/*
+ * The frame around a text switch in its compact form. MudBlazor pads the slot of an outlined field
+ * with 18.5px above and below, which is the right amount for the line of text such a field usually
+ * holds -- a switch of 24px is left swimming in the middle of it. Size.Small already took the switch
+ * down; this brings the frame with it, and it has to name the MudBlazor classes to outweigh their
+ * specificity. Only the two vertical values of that shorthand are replaced, so the 14px to the left
+ * and right stay as they are.
+ */
+.text-switch-dense .mud-input-slot.mud-input-root-outlined {
+    padding-top: 0.5rem;
+    padding-bottom: 0.5rem;
+}

app/MindWork AI Studio/wwwroot/changelog/v26.9.1.md

@@ -41,7 +41,8 @@
 - Fixed the copy button leaving the sources behind. Copy an answer, and its sources come along.
 - Fixed a tile that opens a chat directly always demanding a workspace. Leave the workspace empty in the Assistant Builder, and the tile opens a disappearing chat instead.
 - Fixed the same restriction for plugin authors: a direct-chat launcher can now open a chat without naming a workspace. The example assistant plugin shows both ways.
-- Fixed an answer built without your data sources looking exactly like one that used them. When AI Studio cannot reach the sources you picked, it now tells you instead of quietly answering without them.
-- Fixed the same silence when the step that picks the fitting passages out of your documents cannot run. You are told that the answer rests on everything that was found.
+- Fixed data sources you picked for your chats vanishing from the selection without a word when they cannot be used. AI Studio now lists them by name, so you can see why an answer was created without them.
+- Fixed the data sources you picked for a chat being forgotten the moment you changed your selection while one of them could not be used. Such a source stays selected and is used again as soon as it is available.
+- Fixed the silence when the step that picks the fitting passages out of your documents fails. You are told that the answer rests on everything that was found.
 - Fixed the regenerate button taking an answer away without producing a new one. This happened in chats started from a template that holds no question of your own.
 - Upgraded the Visual Briefing Assistant (in preview) from the prototype to the beta state. The assistant is now completely implemented and is undergoing a deeper testing phase in preparation for release. To try it, open the app settings, allow preview features down to beta, and then enable the Visual Briefing Assistant there.