feat(tray): sync status indicator in account menu

[Rello]

Motivation

• The sync status overlay on the avatar conflicted with the user presence indicator and was visually confusing.
• Sync attention indicators should be scanable in the account list and not obscure the avatar, and the menu needs a bit more width to accommodate an extra column.

Description

• Moved the per-account sync indicator out of the avatar overlay into a dedicated right-aligned column in each account row by updating src/gui/tray/UserLine.qml to add a syncStatusColumn that reserves space even when empty.
• Increased the account menu width budget in src/gui/tray/CurrentAccountHeaderButton.qml by adding an extraMenuWidth so rows do not get cramped.
• Added syncStatusIcon and syncStatusOk properties to User and new roles SyncStatusIconRole/SyncStatusOkRole in UserModel (src/gui/tray/usermodel.h / src/gui/tray/usermodel.cpp).
• Implemented sync status computation in usermodel.cpp with determineSyncStatus and syncStatusForAccount, mapping folder sync results to theme icons (ok, error, warning, pause, sync, offline) and wired FolderMan/AccountState signals to call updateSyncStatus() and emit model changes.

Testing

• No automated unit or integration tests were executed for this QML layout and model change.
• An attempt to capture a visual verification via a headless browser script failed due to no local UI target being available (ERR_EMPTY_RESPONSE).
• Basic runtime/format checks were used during development but no automated build or CI tests were run on the modified code.

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Codex Task

[github-actions]

Artifact containing the AppImage: nextcloud-appimage-pr-9427.zip

Digest: sha256:63e08abd54a752fe8a5264c74fc19e75faa2da1eacf594897fd07358e3f50f4b

To test this change/fix you can download the above artifact file, unzip it, and run it.

Please make sure to quit your existing Nextcloud app and backup your data.

[sonarqubecloud]

Quality Gate failed

Failed conditions
1 Security Hotspot
0.0% Coverage on New Code (required ≥ 80%)
41 New Code Smells (required ≤ 0)
B Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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