Increase test coverage across core, platform, UI, IPC, and applet modules

[edumucelli]

Summary

Increases project test coverage from 89% to 90% (3,711 to 3,884 tests, 269 previously uncovered lines now covered).

Module improvements

Module	Before	After
config.py	94%	100%
tooltip.py	94%	100%
items_service.py	81%	100%
theme/theme.py	95%	100%
theme/migration.py	91%	99%
recent_docs.py	0%	100%
caffeine/inhibit.py	39%	99%
settings.py	93%	96%
base.py	86%	92%
diagnostics.py	18%	49%
update_popup.py	25%	46%

What was covered

• config.py: Normalization edge cases, GLib.Error paths, recent apps validation, cleanup failure handlers
• tooltip.py: Timestamp parsing (ISO/Z-suffix/invalid), relative time labels, recent item tooltip formatting, TypeError handling for transient-for
• items_service.py: D-Bus start/stop edge cases, bus registration failures, signal debouncing, argument validation, pin/unpin state checks
• theme modules: Migration edge cases (path set/pop, backup cleanup failures, atomic write error recovery), indicator style fallback
• recent_docs.py: Full test suite for document-to-app association (filtering by local/exists/has_application, sorting by modification time, limit enforcement)
• settings.py: Recent apps/docs toggle behavior, binding edge cases (sync guards, None values, duplicate values), runtime callbacks
• diagnostics.py: Static methods (status symbols, yes/no helpers), controller init/destroy, current report collection, feature/check row building
• update_popup.py: Controller lifecycle (start scheduling, hide/dismiss actions), remind later, ignore version, URL opening
• caffeine/inhibit.py: ScreenSaverInhibitor DBus acquire/release (all targets fail, GLib.Error handling), SystemdSleepInhibitor subprocess handling (OSError, timeout, kill), CompositeInhibitor edge cases
• base.py: Default hook no-ops, icon source guards, popup anchor, drop URI defaults, font fitting fallthrough
• model: 9 integration tests for recent apps flow (launch-close-recent-pin lifecycle)

Files changed

• Modified 8 existing test files
• Added 4 new test files (recent_docs, diagnostics_ui, update_popup, integration/recent_apps_flow)
• +2,490 lines of test code

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