How would you analyze these chords in Tchaikovsky's Waltz Op39

Question

I'm having trouble figuring out what's happening in the following bars of this piece in Eb major.

• Bar 4: My best guess is that this spells out an Eb fully diminished 7 -- or idim7. (The F in beat 1 of the treble clef is an appoggiatura and not part of the chord harmony.) But I'm not satisfied with this analysis. It feels almost like a dominant to me. Also, even if it were a diminished, maybe it's based off some other note as the root? Ideally something that would make this fit into music theory better.
• Bar 14: I'm lost here. It's an enharmonic Eb7 chord (with an added #4), but with C# instead of a Db, Tchaikovsky is communicating that it should be interpreted otherwise.

I filled in what I think are the other chords below. I'm more confident about these (but not 100% sure)

Answer 1

• Bar 4: This is known as a common-tone diminished chord. It's build on the Eb and is used to prolong the Eb major harmony. For more on common-tone diminished chords, see Understanding function of diminished chord in Paganini's 4th caprice.

• Bar 14: The A is not a chord tone; it's an accented upper neighbor. The G is the chord tone. The chord is an augmented sixth chord built on Eb, moving to D and then ultimately to G minor. This is how augmented sixth chords work. They are typically built on b6 of a minor key, move to the V7, and then resolve to the i chord. For more on augmented sixth chords see How to analyze this chord in Moonlight Sonata 3rd movement?.