bind-aware Hearthstone instructions

[RovxBot]

• The addon reads the actual Hearthstone destination using GetBindLocation().
• “Hearth to Thunderlord Stronghold” is skipped when bound to another location.
• Navigation proceeds to the next objective and calculates an appropriate flight/run route.
• Hearth instructions remain available when the bind location matches.

Bug Fixes:

• The striped square duplicate legacy quest-item button displaying the entire action-bar texture.
• A conditional nohearth instruction was incorrectly being applied to the entire quest step.

Pathing Improvements:

• Path arrivals are now remembered until the guide advances.
• Reaching the final “Follow the path…” point immediately advances navigation to the next talk/accept target.
• Manually completing the final path point behaves the same way.
• Stabilized travel routing so the global cooldown does not repeatedly invalidate Astral Recall and rebuild the route graph.