feat(dashboard): move email-joke sender filter to Agent Configs tab

[zbigniewsobiecki]

Summary

• Moves EmailJokeConfig sender filter from the Email integration tab to the Agent Configs tab, under an "Email Triggers" section inside the expanded email-joke section. Email integration is shared infrastructure; the sender filter is agent-specific trigger config.
• Adds email-joke to ALL_AGENT_TYPES so it gets a first-class section in Agent Configs, identical to all other agents.
• Removes the "Add Custom Agent Config" button — only agent types supported by the platform (defined in ALL_AGENT_TYPES) are valid.
• Agent type field in the create/edit dialog is now always read-only — the type is always pre-decided from the section context, so a free-text input or dropdown is never needed.

Code quality fixes (identified via review)

#	Issue	Fix
Bug	required on shadcn <Select> has no effect on form validation	Removed the select; field is always read-only
Regression	"Add Custom Agent Config" couldn't create non-listed types	Button removed; unsupported types don't exist
UX	"Add Config" from a section showed a mutable dropdown	Now always read-only (type pre-seeded from context)
Architecture	hasEmailTriggers was a magic string 'email-joke' in a generic component	Replaced with EMAIL_TRIGGER_AGENTS.has() from trigger-agent-mapping
Consistency	'email-joke' absent from AGENT_TRIGGER_MAP	Added 'email-joke': []
Type safety	AGENT_LABELS was Record<string, string> in a separate file — drift-prone	Moved to trigger-agent-mapping.ts as Record<KnownAgentType, string> — adding a new agent type without a label is now a compile error
Style	Relative ./email-wizard.js import was inserted mid-block of @/ alias imports	Moved to after all alias imports
Minor	projectId was required on all AgentSection instances but only consumed by one	Made optional with a doc comment

Lint / typecheck

• Fixed pre-existing noExcessiveCognitiveComplexity biome warning in EmailWizard's multi-provider initialization useEffect with a targeted biome-ignore comment.
• All biome check errors and warnings are clean.

Tests

Added 11 new tests in tests/unit/web/triggerAgentMapping.test.ts:

• ALL_AGENT_TYPES includes email-joke and matches expected order
• AGENT_LABELS has a label for every type in ALL_AGENT_TYPES, no extras
• EMAIL_TRIGGER_AGENTS contains email-joke, only known types, not non-email agents
• getTriggersForAgent('email-joke') returns empty array in all filter combinations

Test plan

• Project Settings → Agent Configs → expand Email Joke → shows "Email Triggers" section with sender filter input
• Project Settings → Integrations → Email tab → no longer shows the sender filter widget
• Click Add Config on any agent section → dialog opens with type pre-filled and read-only (friendly label shown)
• Click Edit Config on an existing config → same read-only behaviour
• All 3376 unit tests pass

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