feat(dialog): make xdg-portal the default backend on Linux

[rmakestrash-jpg]

Summary

Changes the default Linux backend for the dialog plugin from gtk3 to xdg-portal.

Motivation

1. GTK3 is unmaintained: Archived March 2024, multiple RUSTSEC advisories
2. Better Wayland support: Native dialog integration without GTK init issues
3. Flatpak compatibility: XDG Portal is standard for sandboxed apps
4. Aligns with rfd defaults: We were explicitly overriding upstream

Breaking Change Consideration

Users can opt back to gtk3:

tauri-plugin-dialog = { version = "X", default-features = false, features = ["gtk3"] }

Related

• Partially addresses Upgrade tauri-plugin-dialog to gtk4-rs (potentially updating the upstream crate rfd) #2376
• Follow-up to feat(dialog): add xdg-portal as an optional feature for rfd #3098 (added xdg-portal as option)
• Related to tauri GTK4 effort: feat(linux): migrate to GTK4 and WebKitGTK 6.0 tauri#14684

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Package Changes Through 923c9f7

There are 25 changes which include dialog-js with minor, dialog with minor, log with minor, log-js with minor, localhost with patch, barcode-scanner with patch, barcode-scanner-js with patch, deep-link with patch, deep-link-js with patch, fs with patch, fs-js with patch, http with patch, http-js with patch, nfc with patch, nfc-js with patch, opener with patch, opener-js with patch, store with patch, store-js with patch, updater with minor, updater-js with minor, upload with minor, upload-js with minor, websocket with patch, websocket-js with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
api-example	2.0.38	2.0.39
api-example-js	2.0.34	2.0.35
deep-link-example-js	2.2.8	2.2.9
barcode-scanner	2.4.2	2.4.3
barcode-scanner-js	2.4.2	2.4.3
deep-link	2.4.5	2.4.6
deep-link-js	2.4.5	2.4.6
fs	2.4.4	2.4.5
fs-js	2.4.4	2.4.5
dialog	2.4.2	2.5.0
dialog-js	2.4.2	2.5.0
opener	2.5.2	2.5.3
opener-js	2.5.2	2.5.3
http	2.5.4	2.5.5
http-js	2.5.4	2.5.5
localhost	2.3.1	2.3.2
log	2.7.1	2.8.0
log-js	2.7.1	2.8.0
nfc	2.3.3	2.3.4
nfc-js	2.3.3	2.3.4
persisted-scope	2.3.4	2.3.5
single-instance	2.3.6	2.3.7
store	2.4.1	2.4.2
store-js	2.4.1	2.4.2
updater	2.9.0	2.10.0
updater-js	2.9.0	2.10.0
upload	2.3.2	2.4.0
upload-js	2.3.2	2.4.0
websocket	2.4.1	2.4.2
websocket-js	2.4.1	2.4.2

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