feat(web): code block toggles, move-to-background, subagent panel prompt, and UI fixes

.changeset/web-code-block-toggles.md

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+---
+'@pymodel/pythinker-code': minor
+---
+
+Add word-wrap and line-number toggles to every code block and diff block in the web chat.

.changeset/web-message-folding.md

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+---
+'@pymodel/pythinker-code': minor
+---
+
+Add a Message folding settings section that turns off auto-folded turns and the tool call summary row.

.changeset/web-resize-and-question.md

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+---
+'@pymodel/pythinker-code': patch
+---
+
+Resize the web panels with the arrow keys, and show the description for a question's free-text answer.

.changeset/web-subagent-panel.md

@@ -0,0 +1,5 @@
+---
+'@pymodel/pythinker-code': patch
+---
+
+Show a subagent's originating prompt above its transcript, centre the transcript, and add a Back to bottom shortcut.

.changeset/web-task-to-background.md

@@ -0,0 +1,5 @@
+---
+'@pymodel/pythinker-code': minor
+---
+
+Move a running Bash command or foreground subagent to the background from its row in the web chat.

.changeset/web-ui-fixes.md

@@ -0,0 +1,5 @@
+---
+'@pymodel/pythinker-code': patch
+---
+
+Recover from a crashed view instead of a blank screen, name a cancelled sign-in, keep the composer toolbar readable at very narrow widths, and stop the sidebar settings label from pushing the footer row.

apps/pythinker-code/dist-web/.web-bundle-manifest.json

@@ -1,4 +1,4 @@
 {
-  "sourceHash": "e6fc28927badd164b21beb1a6062a6469618d97c34e823eaea23cbbb24594b6d",
-  "sourceFileCount": 405
+  "sourceHash": "94836c566a254baa2f20df81ee4f4b6d4b3e864d5b745ae52520e51cdf8edd38",
+  "sourceFileCount": 407
 }