feat: expand agent and web workflows

Improve configuration resilience, attachment handling, and common Web interactions.

Author: elkaix

.changeset/background-task-resume.md

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+---
+'@pymodel/pythinker-code': patch
+---
+
+Remind the agent about unfinished background tasks when work continues in a later turn.

.changeset/local-path-attachments.md

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+---
+'@pymodel/pythinker-code': minor
+---
+
+Attach files from server-local paths in Web prompts.

.changeset/mcp-result-shapes.md

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+---
+'@pymodel/pythinker-code': patch
+---
+
+Accept MCP tool results that contain text content or structured content.

.changeset/model-auth-readiness.md

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+---
+'@pymodel/pythinker-code': patch
+---
+
+Refresh model authentication readiness after provider configuration changes.

.changeset/remote-control-link.md

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+---
+'@pymodel/pythinker-code': patch
+---
+
+Show the complete remote-control link after startup.

.changeset/secondary-model-aliases.md

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+---
+'@pymodel/pythinker-code': patch
+---
+
+Keep configured secondary model aliases unchanged when provider catalogs refresh.

.changeset/slash-command-arguments.md

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+---
+'@pymodel/pythinker-code': patch
+---
+
+Warn before sending arguments to a slash command that does not accept them.

.changeset/web-attachment-previews.md

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+---
+'@pymodel/pythinker-code': minor
+---
+
+Show file, folder, image, and video attachments as compact composer pills with media previews.

.changeset/web-panel-tabs.md

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+---
+'@pymodel/pythinker-code': minor
+---
+
+Open multiple detail views as tabs in the Web panel.

.changeset/web-selection-quotes.md

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+---
+'@pymodel/pythinker-code': minor
+---
+
+Add selected conversation or panel text to the composer as quoted context.