fix(amber, frontend): inline Hugging Face audio uploads as data URLs instead of a server temp file

[PG1204]

What changes were proposed in this PR?

The Hugging Face operator's Audio Upload widget now captures the selected file entirely in the browser and stores it as a self-contained data:audio/…;base64,… URL, instead of relying on a server-side temp file.

Previously the upload ended up as a server-side temp file reference. In a distributed deployment the Python worker that runs the inference is a different process than the web server, so it could not read that path, the uploaded audio never reached the model. The widget now reads the file client-side (FileReader.readAsDataURL) and stores the data URL as the operator's audioInput value, so it travels inside the workflow JSON and the generated Python's _read_audio_input decodes it directly. This mirrors the existing Image Upload widget's data-URL approach.

A 25 MB size cap and input guards ("Choose an audio file.", "Audio file is too large (max 25 MB).", "Could not read this audio file.") are added since base64 inlining bloats the workflow JSON, along with an inline <audio> preview and a Clear button.

Any related issues?

Closes #6968

How was this PR tested?

Frontend unit tests, plus a manual UI check: on the automatic-speech-recognition task, selecting an audio file shows an inline player and stores the value as a data:audio/…;base64,… URL (verified in the console). The size cap, invalid-file guard, and Clear button all behave as expected.

Was this PR authored or co-authored using generative AI tooling?

Yes, this PR was co-authored with Claude in compliance with ASF policy.

[github-actions]

Backport auto-label report

This fix: PR was checked against each actively-supported release branch. release/* labels drive the post-merge backport, so add or remove one to change where this fix lands.

Release branch	Analysis
✅ release/v1.2	Change detected on this branch — label added; this fix is queued to backport here. Requested review from @xuang7.

Auto-label run.

[github-actions]

Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @ELin2025, @aglinxinyuan, @juliethecao
  You can notify them by mentioning @ELin2025, @aglinxinyuan, @juliethecao in a comment.

[github-actions]

⚠️ Benchmark changes need a look

🟢 2 better · 🔴 6 worse · ⚪ 7 noise (<±5%) · 0 without baseline

Compared against main c927890 benchmarked on this same runner, so the delta is largely free of cross-runner hardware noise. The "7d avg" column still reflects the gh-pages dashboard. Treat <±5% as noise unless repeated.

Dashboard · Run

	config	throughput	MB/s	latency	max Δ latest / 7d
🔴	bs=10 sw=10 sl=64	485	0.296	17,802/51,753/51,753 us	🔴 +100.3% / 🔴 +231.9%
🔴	bs=100 sw=10 sl=64	1,227	0.749	78,387/108,065/108,065 us	🔴 +8.4% / 🟢 +23.1%
🟢	bs=1000 sw=10 sl=64	1,430	0.873	700,537/740,069/740,069 us	🟢 -6.8% / 🟢 +37.9%

Baseline details

Latest main c927890 from same runner

config	metric	PR	latest main	7d avg	Δ latest	Δ 7d
bs=10 sw=10 sl=64	throughput	485 tuples/sec	567 tuples/sec	771.02 tuples/sec	-14.5%	-37.1%
bs=10 sw=10 sl=64	MB/s	0.296 MB/s	0.346 MB/s	0.471 MB/s	-14.5%	-37.1%
bs=10 sw=10 sl=64	p50	17,802 us	18,688 us	12,749 us	-4.7%	+39.6%
bs=10 sw=10 sl=64	p95	51,753 us	25,836 us	15,594 us	+100.3%	+231.9%
bs=10 sw=10 sl=64	p99	51,753 us	25,836 us	19,320 us	+100.3%	+167.9%
bs=100 sw=10 sl=64	throughput	1,227 tuples/sec	1,219 tuples/sec	997.05 tuples/sec	+0.7%	+23.1%
bs=100 sw=10 sl=64	MB/s	0.749 MB/s	0.744 MB/s	0.609 MB/s	+0.7%	+23.1%
bs=100 sw=10 sl=64	p50	78,387 us	81,813 us	100,339 us	-4.2%	-21.9%
bs=100 sw=10 sl=64	p95	108,065 us	99,697 us	106,781 us	+8.4%	+1.2%
bs=100 sw=10 sl=64	p99	108,065 us	99,697 us	113,101 us	+8.4%	-4.5%
bs=1000 sw=10 sl=64	throughput	1,430 tuples/sec	1,401 tuples/sec	1,037 tuples/sec	+2.1%	+37.9%
bs=1000 sw=10 sl=64	MB/s	0.873 MB/s	0.855 MB/s	0.633 MB/s	+2.1%	+37.9%
bs=1000 sw=10 sl=64	p50	700,537 us	715,645 us	971,388 us	-2.1%	-27.9%
bs=1000 sw=10 sl=64	p95	740,069 us	794,037 us	1,013,249 us	-6.8%	-27.0%
bs=1000 sw=10 sl=64	p99	740,069 us	794,037 us	1,039,879 us	-6.8%	-28.8%

Raw CSV

config_idx,batch_size,schema_width,string_len,num_batches,total_ms,total_tuples,total_bytes,tuples_per_sec,mb_per_sec,lat_p50_us,lat_p95_us,lat_p99_us
0,10,10,64,20,412.37,200,128000,485,0.296,17802.47,51753.00,51753.00
1,100,10,64,20,1630.27,2000,1280000,1227,0.749,78386.87,108064.75,108064.75
2,1000,10,64,20,13984.42,20000,12800000,1430,0.873,700536.53,740069.14,740069.14

[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.10345% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.24%. Comparing base (c927890) to head (04a8320).

Files with missing lines	Patch %	Lines
...io-upload/hugging-face-audio-upload.component.html	0.00%	0 Missing and 1 partial ⚠️
...udio-upload/hugging-face-audio-upload.component.ts	96.42%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7790      +/-   ##
============================================
- Coverage     91.25%   91.24%   -0.02%     
+ Complexity     4471     4457      -14     
============================================
  Files          1171     1171              
  Lines         47124    46999     -125     
  Branches       5286     5260      -26     
============================================
- Hits          43003    42882     -121     
+ Misses         2447     2444       -3     
+ Partials       1674     1673       -1     

Flag	Coverage Δ		*Carryforward flag
access-control-service	81.00% <ø> (ø)		Carriedforward from c927890
agent-service	98.62% <ø> (ø)		Carriedforward from c927890
amber	87.96% <ø> (-0.06%)	⬇️
computing-unit-managing-service	73.67% <ø> (ø)		Carriedforward from c927890
config-service	86.73% <ø> (ø)		Carriedforward from c927890
file-service	68.90% <ø> (ø)		Carriedforward from c927890
frontend	92.63% <93.10%> (+<0.01%)	⬆️
notebook-migration-service	83.74% <ø> (ø)		Carriedforward from c927890
pyamber	97.57% <ø> (ø)		Carriedforward from c927890
workflow-compiling-service	77.19% <ø> (ø)		Carriedforward from c927890

*This pull request uses carry forward flags. Click here to find out more.

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