程序员阿江(Relakkes) 47cc63c402 fix: make portable storage mode understandable and selectable
The previous portable-mode settings were hard to discover and mostly
explained through environment variables. Users could not pick a target
folder from the desktop UI or clearly understand which config directory
would become active after switching modes.

This moves the control to a lower-priority storage section, makes the
active directory source explicit, supports choosing a portable data
folder, and prepares the desktop app for a controlled restart so the
new storage location takes effect.

Constraint: Directory picking and relaunch require the Tauri desktop runtime
Rejected: Keep environment-variable-only setup | users could not discover or validate the target path from the app
Confidence: high
Scope-risk: moderate
Tested: cd desktop && bun run test -- generalSettings settingsStore
Tested: bun run check:desktop
Tested: bun run check:native
Tested: bun run check:coverage
Tested: bun run verify
Tested: Maintainer manual desktop UI test
Not-tested: Windows relaunch path beyond existing native coverage
2026-05-18 22:59:20 +08:00
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