Fix broken dio

[w568w]

This PR:

• Fix the critical issue that dio stops working because of interface regression by downgrading dio
• Update the postgraduate timetable endpoint
• Fix the 500 Error after signing out by reseting Fudan network session state on app restart/phoneixed
• Add selection context menu for selectable text

[Copilot]

Pull request overview

This PR addresses network/session regressions and UX issues by pinning dio to a known-good version, strengthening session reset behavior on restart, updating the postgraduate timetable endpoint selection, and restoring the default text selection context menu for linkified selectable text.

Changes:

• Pin dio to 5.10.0 to avoid interceptor breakage in 5.11.0.
• Update postgraduate timetable fetching to try a primary endpoint with fallback to a secondary endpoint.
• Ensure Fudan session state is fully reset on restart and restore default selection context menu behavior for selectable linkified text.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pubspec.yaml	Pins dio to 5.10.0 with a TODO note to upgrade after upstream fix.
pubspec.lock	Updates locked dio version/hash to 5.10.0.
lib/widget/libraries/linkify_x.dart	Restores default selectable text context menu via contextMenuBuilder.
lib/util/flutter_app.dart	Awaits Fudan session clearing during app restart and guards with context.mounted.
lib/repository/fdu/postgraduate_timetable_repository.dart	Adds primary/secondary endpoint retry logic for PG timetable fetch.
lib/repository/fdu/neo_login_tool.dart	Rebuilds authentication queues and closes Dio client during session clear; adjusts login batching logic placement.

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