Improve workspace workflows, Windows upgrades, and MPRIS reliability

[pcarrier]

Summary

This PR contains five logical commits:

1. Windows self-upgrade: fix the PowerShell installer and CLI handoff used by self-upgrade.
2. Muster workflows: list active external stacks, group terminal previews by stack, and remove a needless resolver borrow.
3. Workspace UI: make embedded connection status actionable, align attention and active-pane borders, and keep Git log ranges transient per UI session.
4. Server test organization: keep Unix IPC path tests after the implementation they cover.
5. MPRIS reliability: always accept a new subscription after unsubscribe and retry still-owned players after bounded D-Bus failures.

Screenshots

Connected

Connecting / retry

Mobile

Test plan

• pnpm --dir js/ui typecheck
• pnpm --dir js/ui test (63 files, 482 tests)
• cargo test --manifest-path extensions/muster/Cargo.toml (84 tests)
• cargo test -p blit-desktop mpris (14 tests)
• cargo test -p blit-server mpris (4 tests)
• cargo test -p blit-server path_tests (2 tests)
• cargo clippy -p blit-desktop -p blit-server --tests -- -D warnings

[indent]

PR Summary

Makes the StatusBar connection-status chip actionable inside embedded shells (e.g. blit.sh/s shares), where it was previously a disabled, non-clickable set of status dots. App shells keep opening the Remotes dialog unchanged.

• Adds a ConnectionStatusPopover that lists each connection with its state (connecting/authenticating/connected/error/disconnected/closed), error text, and retry count.
• Offers a per-connection action: "Manage server" when connected (opens the manage tile), "Reconnect" otherwise.
• Wires new onManageConnection/onReconnectConnection StatusBar props in Workspace, capability-gated so embedded shells get the popover and app shells keep onRemotes.
• Extends the existing outside-click and Escape handlers to also dismiss the new popover.
• Adds localized statusbar.connectionStatus and statusbar.manageServer in all six locales.

Issues

All clear! No issues remaining. 🎉

2 issues already resolved

• In the new connection-status popover, the "connected" label uses the English-only remotes.status.connected key while the other states use the fully-localized status.* keys, so a non-English user sees a mixed-language popover (e.g. a localized "connecting" but an English "Connected"). (fixed by commit 04d600e)
• The force-push dropped the earlier localization fix (commit 04d600e): connectionStatusText again returns the English-only remotes.status.connected for the connected state while other states use localized status.* keys, so non-English users get a mixed-language popover again. The status.connected key and connectionStatusLabel helper are gone from the branch. (fixed by commit 9773d98)

_{View session}

[github-actions]

Coverage

Crate	Lines	Functions	Regions
alacritty-driver	75.7% (934/1234)	78.7% (74/94)	79.0% (1521/1926)
browser	0.0% (0/825)	0.0% (0/69)	0.0% (0/1404)
cli	40.8% (6227/15248)	46.8% (619/1324)	41.7% (9702/23283)
compositor	35.1% (6046/17209)	49.9% (503/1009)	34.9% (8312/23786)
desktop	78.7% (4409/5605)	71.9% (388/540)	75.4% (6119/8120)
fonts	85.3% (756/886)	89.9% (71/79)	86.4% (1485/1719)
fssync	92.5% (5516/5961)	94.4% (501/531)	92.7% (10181/10981)
gateway	35.1% (698/1990)	40.6% (69/170)	32.1% (1059/3303)
git	87.7% (4646/5295)	90.5% (379/419)	87.6% (7414/8463)
guest	82.9% (2342/2826)	80.7% (264/327)	81.5% (3905/4792)
lsp	77.2% (2688/3483)	79.4% (262/330)	74.9% (4210/5619)
proxy	19.2% (172/898)	20.5% (26/127)	21.0% (293/1392)
remote	92.0% (17592/19123)	94.8% (1235/1303)	89.5% (28534/31876)
sd-notify	73.9% (68/92)	100.0% (6/6)	83.2% (109/131)
server	57.7% (33482/58059)	65.0% (2888/4442)	59.1% (50858/86126)
ssh	32.2% (165/512)	48.2% (27/56)	31.4% (261/830)
upsidedown	31.4% (391/1247)	27.8% (55/198)	34.8% (797/2287)
webrtc-forwarder	8.5% (238/2805)	10.7% (22/205)	6.3% (289/4595)
webserver	65.1% (1288/1978)	67.6% (177/262)	67.2% (2159/3214)
Total	60.3% (87658/145276)	65.8% (7566/11491)	61.3% (137208/223847)

[blacksmith-sh]

Found 19 test failures on Blacksmith runners:

Failures

Test	View Logs
[chromium] › tests/ font-size-sync.spec.ts:12:5 › font size stays local while previewing and reaches peers on Apply	View Logs
[chromium] › tests/ mobile-keyboard.spec.ts:200:5 › a tap while the keyboard failed to rise retries instead of hiding	View Logs
[chromium] › tests/ mobile-keyboard.spec.ts:256:5 › the switcher stays in view when the keyboard pans the v isual viewport	View Logs
[chromium] › tests/ mobile-keyboard.spec.ts:293:5 › key-line taps cancel the touch so the keyboard stays up	View Logs
[chromium] › tests/ mobile-keyboard.spec.ts:362:5 › the icon's keyboard survives focus landing on a surface canvas	View Logs
[chromium] › tests/ mobile-keyboard.spec.ts:455:5 › iOS hops focus through a host when the target already h olds it	View Logs
[chromium] › tests/ mobile-keyboard.spec.ts:61:5 › keyboard rises only from the toggle and the key line tra cks it	View Logs
[chromium] › tests/ pane-tools.spec.ts:116:7 › Pane multitool on a main-view terminal › clicking relocates the toolbar and reverses it on the left	View Logs
[chromium] › tests/ pane-touch-drag.spec.ts:128:7 › Grip drag with a finger › a pen is left to the native p ath	View Logs
[chromium] › tests/ pane-touch-drag.spec.ts:179:7 › Grip drag with a finger › dragging within a quarter pre views and relocates the toolbar	View Logs

...and 9 more test failures. View all on Blacksmith

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