wip: feat: add TUI w/ bubbletea support

[floreks]

• Add assets.go to embed terminal cell logo for CLI
• Implement core authentication types and interfaces in bridge/types.go
• Develop CLI state reading logic in bridge/welcome/local.go
• Add unit tests for welcome package functionality
• Create access management infrastructure in bridge/access/local.go
• Include diagnostics view tests in tui/screens/diagnostics
• Establish access management and tests in bridge/access/access.go
• Add TUI models for diagnostics and access screens

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• If required, I have updated the Plural documentation accordingly.
• I have added tests to cover my changes.
• I have added a meaningful title and summary to convey the impact of this PR to a user.
• I have added relevant labels to this PR to help with categorization for release notes.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	charm.land/​bubbletea/​v2@​v2.0.8
	github.com/​charmbracelet/​x/​ansi@​v0.11.7
	github.com/​charmbracelet/​x/​term@​v0.2.2
	charm.land/​lipgloss/​v2@​v2.0.5
	charm.land/​bubbles/​v2@​v2.1.1
	github.com/​charmbracelet/​colorprofile@​v0.4.3
	github.com/​zalando/​go-keyring@​v0.2.6

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[greptile-apps]

Greptile Summary

Adds a Bubble Tea terminal interface and supporting authentication/access infrastructure.

• Registers the new plural tui command and adds welcome, access, and diagnostics screens.
• Introduces context-aware authentication orchestration, credential storage, profile migration, and service-account impersonation.
• Adds reusable TUI components, themes, embedded assets, golden fixtures, and unit tests.

Confidence Score: 2/5

The credential rollback and stale-cursor panic need to be fixed before merging; reverse panel navigation also behaves incorrectly.

Failed profile updates can remove an existing credential, and loading a shorter profile list leaves stale cursors that panic when the user confirms a selection.

Files Needing Attention: pkg/bridge/access/access.go, tui/screens/access/model.go

Important Files Changed

Filename	Overview
pkg/bridge/access/access.go	Adds access-profile orchestration, but failed saves can delete credentials belonging to existing profiles.
pkg/bridge/access/local.go	Adds owner-only atomic registry persistence and one-time migration of legacy app and console profiles.
pkg/bridge/credentials.go	Adds keyring-backed credential storage with a permission-restricted filesystem fallback.
pkg/bridge/auth.go	Moves device login, identity resolution, impersonation, and access-token exchange behind a context-aware service.
pkg/common/common.go	Migrates existing login flows onto the bridge authentication service while retaining legacy persistence behavior.
tui/screens/access/model.go	Implements access-screen state handling, but reloads can leave invalid cursors that panic on confirmation and reverse panel navigation moves in the wrong direction.
tui/app/model.go	Adds top-level TUI routing, sizing, and quit/cancellation handling.
cmd/command/tui/tui.go	Wires production welcome and access dependencies into the new explicit TUI command.

_{Reviews (1): Last reviewed commit: "feat: initialize Plural CLI authenticati..." | Re-trigger Greptile}