MS-26473 PDChat: wake phrase for Voice Mode, and demo controls for every voice option

[davidnmbond]

Part of MS-26473.

What

• Wake phrase. New IChatService.WakePhrases (default null, off) and IChatService.VoiceIdleTimeout (default 10 seconds), both default interface members backed by ChatServiceDefaultState. With wake phrases set, Listening with no word for the idle timeout moves to the new PDChatVoiceState.Dormant (appended, no renumbering). It never goes dormant while the text box has focus or an auto-send is pending. While dormant, words are not typed and pauses never send; a rolling buffer of normalised words (lowercase, letters and digits only) is matched against each phrase, so "HEY dumbbot," wakes it, and only the words after the phrase are typed. A host that reports only pauses can wake it from the turn text. The microphone keeps streaming while dormant, and the WakePhrases remarks tell hosts to make that clear to users.
• Status line reads Waiting for "<first phrase>"…; the microphone button stays on, says it is waiting, and pressing it turns Voice off.
• Demo. DumbChatService now has settable VoiceEndpoints, Agents, Models, WakePhrases, VoiceIdleTimeout, VoiceAutoSendDelay, IsReadAloudEnabled, SelectedAgentId and SelectedModelId, each raising OnConfigurationChanged. The PDChat page has a Voice and Assistant section for all of them, and the documentation describes the toolbar, read-aloud, models and wake phrase. The simulated microphone starts every other utterance with "Hey DumbBot," so the wake phrase can be demonstrated.

Verification

• dotnet build PanoramicData.Blazor.Test -c Release: 0 errors, 0 warnings. PanoramicData.Blazor.Web also builds clean (apart from its existing not-packable notice).
• Full suite via the test executable: 3757 passed, 0 failed (main baseline 3729; 28 new: PDChatTests.WakePhrase.cs and DumbChatServiceVoiceTests.cs). The PDChat and demo-service classes were rerun five times with no failure.
• Demo started in Development on a local port: /pdchat renders the new section and the simulated voice module is served. The interactive wake in a real browser was not exercised.

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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🟢 Metrics 52 complexity · 0 duplication

Metric	Results
Complexity	52
Duplication	0

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🟢 Coverage 95.04% diff coverage · -0.04% coverage variation

Metric	Results
Coverage variation	✅ -0.04% coverage variation
Diff coverage	✅ 95.04% diff coverage

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Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (7756e23)	15856	15843	99.92%
Head commit (3d13d99)	15970 (+114)	15951 (+108)	99.88% (-0.04%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#233)	121	115	95.04%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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