Calling start dictation while already dictating resets session data

[coderabbitai]

Description

Calling the 'start dictation' intent while already dictating resets the active dictation session, wiping the dictation_stack and file metadata for that session.

Issue Details

The handle_start_dictation_intent method currently always calls start_dictation(message) even when is_dictating(sess) returns True. This causes the dictation stack and file name to be reset mid-session, losing all previously captured utterances.

Context

• Related PR: fix: is_dictating #71
• Review comment: fix: is_dictating #71 (comment)
• Requested by: @JarbasAl

Expected Behavior

When a user attempts to start dictation while already dictating, the system should acknowledge that dictation is already active without resetting the session data.