fix(profile): prevent saving profile when no changes are made (@AzureNightlock)

[AzureNightlock]

Description

This PR: Disables the save button when no changes are made or when inputs are invalid.

Changes:

• Wired up save button to disable/enable based on change detection
• Added ProfileState type and getProfileState() to capture the form state
• Refactored buildUpdatesFromInputs() to buildUpdatesFromState() so now it takes a ProfileState instead of reading directly from inputs
• Added updateSaveButtonState() to disable the save button when nothing has changed or when inputs are invalid
• Added hasProfileChanged() to compare the current state against the original saved state

Additional fixes:

• Added getOriginalValue parameter to addValidation() to hide the validation indicator when the user types back the original saved value
• Fixed initializeCharacterCounters() to only initialize once across modal opens
• Removed manual length checks in updateProfile() since Zod schemas already handle validation

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Closes #7683

[fehmer]

We are currently migrating to solidjs, maybe don't put too much efforts into the old codebase

[AzureNightlock]

Ahh got it, thanks for the heads up!