Stop forcing Qt platform session-wide

[koljaSx]

Summary

• stop exporting QT_QPA_PLATFORM=wayland;xcb to every application in the Hyprland session
• keep Omarchy's Quickshell explicitly on its supported Wayland platform
• clean the stale value from systemd, D-Bus, and the running Hyprland process during upgrade
• tell users to fully restart Steam when it still holds the inherited value
• cover the steady-state and migration boundaries with regression tests

Why

SteamVR bundles Qt 5.5 with only the XCB platform plugin. That Qt release treats the modern semicolon-separated fallback value as one literal plugin name, so vrmonitor aborts during QGuiApplication initialization instead of falling back to XWayland.

Scoping QT_QPA_PLATFORM=wayland to Quickshell preserves native Wayland for the Qt component Omarchy controls without imposing modern Qt fallback syntax on third-party bundled runtimes.

The migration also repairs existing graphical sessions. It unsets the systemd user-manager value, replaces the D-Bus activation value with an empty Qt override, and empties the running compositor's value so future keybind launches are clean. Partial cleanup failures keep the migration pending for retry.

Closes #8701

Testing

• bash test/shell.d/launch-shell-test.sh
• bash test/shell.d/qt-platform-env-migration-test.sh
• bash -n bin/omarchy-launch-shell migrations/1787946762.sh test/shell.d/launch-shell-test.sh test/shell.d/qt-platform-env-migration-test.sh
• git diff --check
• ./test/all (CLI suite passed; shell suite reached the new regression successfully, with seven unrelated environment-dependent failures from the missing omarchy-pkgs checkout, sandboxed home writes, and unavailable network/visual conditions)

[Copilot]

Pull request overview

Scopes Qt Wayland selection to Omarchy’s shell instead of the entire session, addressing compatibility with legacy bundled Qt runtimes.

Changes:

• Removes the global Qt platform setting.
• Sets Wayland when launching Quickshell.
• Adds regression assertions for platform configuration.

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Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
bin/omarchy-launch-shell	Sets Quickshell’s Qt platform environment.
default/hypr/envs.lua	Removes session-wide Qt platform selection.
test/shell.d/launch-shell-test.sh	Tests shell and global environment configuration.

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[omarchybot]

Following DHH’s closure of #10573, The declined Chrome Qt5 dependency workaround does not settle this PR’s SteamVR/bundled Qt 5.5 platform-selection failure. Its session-wide environment proposal remains a separate maintainer decision.

Scope checked by GPT-6 in Codex and Codex Medium against the discussion and landed change; review independence is not guaranteed. No tests were rerun for this cleanup.

Omabot on behalf of DHH