Move h5inspect_post execution inside the app loop

[Copilot]

Previously, pressing i exited the TUI, ran the post command, then restarted the app from scratch. The post command now runs inline without losing app state.

Changes

• New KeyPressResult enum — handle_keypress (and its sub-handlers) now return Redraw | DontRedraw | RunPostCommand(Option<String>, String) instead of ()
• RunPostCommand handled in run() loop — when i is pressed, the loop pauses the TUI (disable raw mode + leave alternate screen), runs the post command, then restores the TUI (re-enter alternate screen + enable raw mode + terminal.clear()); terminal errors are logged via log::warn!
• Removed AppFinishingState::ShouldRunCommand — no longer needed; AppFinishingState is now just Continue | Quit
• Simplified main.rs — outer loop and post-command dispatch logic removed; run() is called once

Original prompt

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This section details on the original issue you should resolve

<issue_title>move h5inspect post inside app</issue_title>
<issue_description>Instead of the having to exit to run h5inspect post, it should run it during the main app loop.
The on key press function should return an enum of three values, Redraw, DontRedraw, RunPostCommand.
The main app loop should then reset terminal, run the command, then set the terminal back up it can continue listening to events.
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes move h5inspect post inside app #11

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