Mode picker in Sessions app#298199

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sandy081 wants to merge 11 commits intomainfrom

copilot-worktree-2026-02-26T22-26-52

Commits on Feb 27, 2026

feat: add mode picker functionality and integrate mode management in chat sessions
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feat: integrate IChatSessionsService and enhance mode picker with custom agent target
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feat: update mode picker to use MenuItemAction and remove setMode callback
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fix: update available modes logic to use effective target for custom agent selection
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feat: enhance mode picker to support configuration of custom agents and update item structure
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feat: integrate ILanguageModelToolsService and enhance mode handling in SessionsManagementService
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feat: add group property to configure custom agents action in mode picker
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feat: update session mode handling to reflect selected mode in input model
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Merge remote-tracking branch 'origin/main' into copilot-worktree-2026-02-26T22-26-52
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Commits on Mar 3, 2026