fix: replace filename truncation with user warning

[Diksha-MukherjeeAgarwal]

Added validation to prevent users from saving filenames longer than 200 characters and surfacing a warning via Snackbar instead of silently truncating the input.

Summary by Sourcery

Bug Fixes:

• Prevent filenames longer than 200 characters from being saved by validating input before closing the dialog.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds filename length validation when saving recordings, warning the user via a Snackbar and preventing silent truncation, while normalizing the saved filename text.

Sequence diagram for filename save validation and Snackbar warning

sequenceDiagram
  actor User
  participant SoundMeterScreenState
  participant AlertDialog
  participant ScaffoldMessenger
  participant SnackBar
  participant CsvService

  User->>SoundMeterScreenState: tapSaveRecording()
  SoundMeterScreenState->>AlertDialog: showSaveRecordingDialog(maxLength 200)
  User->>AlertDialog: enterFilename()
  User->>AlertDialog: pressSave()
  AlertDialog->>SoundMeterScreenState: onSavePressed(filenameController.text.trim())
  alt filename length > 200
    SoundMeterScreenState->>ScaffoldMessenger: showSnackBar()
    ScaffoldMessenger->>SnackBar: construct(message "File name must be less than 200 characters.")
    SnackBar-->>User: displayWarning()
    SoundMeterScreenState-->>AlertDialog: keepDialogOpen()
  else filename length <= 200
    SoundMeterScreenState->>AlertDialog: Navigator.pop(context, text)
    AlertDialog-->>SoundMeterScreenState: returnFileName(text)
    SoundMeterScreenState->>CsvService: writeMetaData(fileName)
    CsvService-->>SoundMeterScreenState: metaDataWritten()
  end

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File-Level Changes

Change	Details	Files
Validate and normalize the filename before saving, and show a Snackbar warning if it exceeds 200 characters instead of silently truncating.	Set a 200-character maxLength on the filename TextField in the save recording dialog. Trim the filename text before use and reuse the trimmed value for saving. Add a length check in the save button handler that shows a Snackbar warning when the filename exceeds 200 characters and aborts closing the dialog in that case. Pass the validated, trimmed filename back via Navigator.pop instead of the raw controller text.	lib/view/soundmeter_screen.dart

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[github-actions]

Build Status

Build successful. APKs to test: https://github.com/fossasia/pslab-app/actions/runs/24446765001/artifacts/6447325389.

Screenshots

Android Screenshots

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[Diksha-MukherjeeAgarwal]

Closing this duplicate PR. All of these changes have been added to the original PR #3177 to keep the commit history and conversation in one place.