Add support for short spec names and related UI toggle

[armin-l]

I vibe coded a toggle for the short spec name that was already in the repo as ToDo.
Works on my machine :)

[Copilot]

Pull request overview

Adds a per-character UI toggle to display “short” vs “full” spec names, and normalizes previously saved raidset spec strings so they match the selected display mode.

Changes:

• Add short/full spec name selection logic and a migration helper to normalize saved raidset spec strings.
• Add a “Use short spec names” checkbox to the raidset UI and initialize it from saved variables.
• Persist the toggle via a new per-character saved variable and initialize it on addon enable.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
RaidBrowser/stats.lua	Introduces short/full spec name selection helpers and normalization for saved raidset spec strings.
RaidBrowser/raidset_frame.lua	Adds UI checkbox toggle and selection normalization for raidset dropdown initialization.
RaidBrowser/core.lua	Initializes the new saved variable and calls raidset UI initialize during OnEnable.
RaidBrowser/RaidBrowser.toc	Adds the new per-character saved variable to the TOC.

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[Copilot]

short_spec_check is assigned without local, which creates/overwrites a global and can lead to hard-to-debug collisions between addons or files. Declare it as a local upvalue (e.g., local short_spec_check near the top) and keep the checkbox frame reference scoped to this module.

Suggested change

	short_spec_check = CreateFrame("CheckButton", "RaidBrowserRaidSetShortSpecCheckButton", LFRBrowseFrame, "UICheckButtonTemplate")
	local short_spec_check = CreateFrame("CheckButton", "RaidBrowserRaidSetShortSpecCheckButton", LFRBrowseFrame, "UICheckButtonTemplate")

[Copilot]

RaidBrowser.check_button() runs before RaidBrowser.gui.raidset.initialize(), but check_button() depends on current_selection (set by initialize() via set_selection). With the current order, the Save button state can be incorrect on login until the user changes the dropdown. Call RaidBrowser.gui.raidset.initialize() before RaidBrowser.check_button(), or have initialize() call RaidBrowser.check_button() after setting the selection.

Suggested change

	RaidBrowser.check_button()
	RaidBrowser.gui.raidset.initialize();
	RaidBrowser.gui.raidset.initialize();
	RaidBrowser.check_button()