feat(netbird): Add custom terminal command support for SSH and Ping actions

[l1a]

Adds support for configuring a custom terminal command in the NetBird plugin settings, to be used when launching SSH or Ping actions.

Also handles passing arguments correctly by using -- for terminals that require it (like ptyxis, gnome-terminal, wezterm), while falling back to -e for others.

Changes:

• Add terminalCommand to manifest.json defaults.
• Add NTextInput in Settings.qml to allow users to specify a custom terminal command.
• Update detectTerminal in Main.qml to respect the user's custom terminal command if provided, bypassing auto-detection.
• Update Panel.qml to read the configured terminal command and construct the execute command appropriately using buildTerminalCmd to account for different execution flags (-e vs --).

[github-actions]

Automatic Code Quality Review

File: netbird/Main.qml

• (H) Missing required property pluginApi. For example:

property var pluginApi: null

File: netbird/Panel.qml

• (H) Missing required property pluginApi. For example:

property var pluginApi: null

• (H) Missing required property geometryPlaceholder. For example:

readonly property var geometryPlaceholder: panelContainer

• (H) Missing required property allowAttach. For example:

readonly property bool allowAttach: true

File: netbird/Settings.qml

• (L) Line 135: When it comes to translations there is no need for fallback values. From: pluginApi?.tr("example") || "value". To: pluginApi?.tr("example")

+        label: pluginApi?.tr("settings.terminal") || "Terminal Configuration"

• (L) Line 136: When it comes to translations there is no need for fallback values. From: pluginApi?.tr("example") || "value". To: pluginApi?.tr("example")

+        description: pluginApi?.tr("settings.terminal-desc") || "Set a custom terminal command or leave blank for auto-detection"

• (L) Line 140: When it comes to translations there is no need for fallback values. From: pluginApi?.tr("example") || "value". To: pluginApi?.tr("example")

+                return (pluginApi?.tr("settings.terminal-detected") || "Auto-detected") + ": " + detected;

• (L) Line 142: When it comes to translations there is no need for fallback values. From: pluginApi?.tr("example") || "value". To: pluginApi?.tr("example")

                 return pluginApi?.tr("settings.terminal-none") || "No terminal emulator detected";

• (H) Missing required property pluginApi. For example:

property var pluginApi: null

[github-actions]

@Cleboost - this PR modifies your plugin. Please review when you have a chance.

[Cleboost]

lgtm

[Cleboost]

@spiros132 can you take a look?

[spiros132]

Looks good, just don't forget to bump the version.

[spiros132]

Perfect, thank you!

@ItsLemmy