Add class filtering and alphabetical sorting for loadout profiles

[Copilot]

Users with many loadouts across multiple classes/specs need better organization. Added profile filtering by current class and alphabetical sorting.

Changes

• Class metadata extraction: Parse and store class from export text (# CLASS: Warrior) when profiles are saved
• Filter checkbox: Show only profiles matching current character's class via UnitClass("player")
• Sort checkbox: Alphabetically sort visible profiles by name
• Settings persistence: Both options stored in MyslotSettings and persist across sessions
• Backward compatibility: Profiles without class metadata are always shown and have class extracted lazily

Implementation

Modified gui.lua only (~100 lines):

-- Extract class from export comment
local function ExtractClassFromExport(exportText)
    local _, _, className = string.find(exportText, "#%s*[Cc][Ll][Aa][Ss][Ss]%s*:%s*([^\n\r]+)")
    return className and strtrim(className) or nil
end

-- Filter and sort in dropdown initialization
for i, txt in pairs(exports) do
    if not txt.class and txt.value then
        txt.class = ExtractClassFromExport(txt.value)
    end
    
    local shouldShow = true
    if MyslotSettings.filterCurrentClass and txt.class then
        shouldShow = (txt.class == UnitClass("player"))
    end
    
    if shouldShow then
        table.insert(profilesToShow, {index = i, name = txt.name})
    end
end

if MyslotSettings.sortAlphabetically then
    table.sort(profilesToShow, function(a, b) return a.name < b.name end)
end

UI: Two checkboxes below profile management buttons trigger immediate dropdown refresh.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Request: Sorting and Filtering</issue_title>
<issue_description>For those of us who play lots of classes and specs, we end up with dozens of loadouts. To help with that, I request two features:

• A way to filter loadouts based on the class we are logged into, and
• A way to sort or group the shown loadout.

Even something as simple as an alphabetical sort would greatly improve the user experience.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Request: Sorting and Filtering #102

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