Add a overlay message field for UI to standardize the input panel base notification

[wengxt]

Summary by CodeRabbit

• New Features

  • Added support for displaying temporary overlay messages in the input panel.
  • Input-method information can now appear as a dedicated overlay message.

• Bug Fixes

  • Improved presentation of preedit text, auxiliary messages, and candidate lists when overlays are shown.
  • Ensured overlay messages are cleared correctly after input-method information is dismissed.
  • Improved consistency across classic, D-Bus, and Kimpanel interfaces.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: b8d35ee4-4e1f-487e-8012-34fe3d526c54

📥 Commits

Reviewing files that changed from the base of the PR and between 006ba1d and 4db08ce.

📒 Files selected for processing (1)

• src/lib/fcitx/inputpanel.h

🚧 Files skipped from review as they are similar to previous changes (1)

• src/lib/fcitx/inputpanel.h

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📝 Walkthrough

Walkthrough

The change adds overlay-message state to InputPanel, uses it for input-method information, renders it through DBus, classic, and Kimpanel clients, and relocates startup logging from the server entry point into Instance construction.

Changes

Input panel overlay messages

Layer / File(s)	Summary
Overlay state and input-method information src/lib/fcitx/inputpanel.h, src/lib/fcitx/inputpanel.cpp, src/lib/fcitx/instance.cpp	InputPanel stores, exposes, updates, and resets overlay text; input-method information now uses and clears the overlay message.
Overlay rendering in UI clients src/frontend/dbusfrontend/dbusfrontend.cpp, src/ui/classic/inputwindow.cpp, src/ui/kimpanel/kimpanel.cpp	DBus, classic, and Kimpanel UI paths select overlay text when regular input-panel content is absent.

Startup logging

Layer / File(s)	Summary
Instance startup logging src/lib/fcitx/instance.cpp, src/server/main.cpp	Startup and Flatpak logging move into Instance construction, and the prior server-level Flatpak log is removed.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant InputState
  participant InputPanel
  participant UIClients
  InputState->>InputPanel: setOverlayMessage(input-method text)
  InputState->>UIClients: update UI
  InputPanel->>UIClients: provide overlay when panel is empty
  UIClients->>UIClients: render auxiliary overlay text
  InputState->>InputPanel: clear matching overlay message
  InputState->>UIClients: update UI

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding an overlay message field to standardize input panel notifications.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/frontend/dbusfrontend/dbusfrontend.cpp`:
- Around line 229-240: Route overlay messages through Instance::outputFilter
before assigning auxUp in dbusfrontend.cpp, inputwindow.cpp, and kimpanel.cpp at
the specified ranges, using each site’s existing input context or frontend
context argument. Preserve the current overlay handling while ensuring all three
renderers apply output filtering.

In `@src/lib/fcitx/inputpanel.h`:
- Around line 77-98: Update the documentation for InputPanel::overlayMessage()
to state that the overlay message is displayed only when the regular input panel
is empty, so normal panel content takes precedence. Remove or revise the wording
claiming that setting it suppresses all other fields, while preserving the
existing temporary-message and reset behavior.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 4af5d7ce-fcfc-4f82-9134-df654f41fccb

📥 Commits

Reviewing files that changed from the base of the PR and between 1426cce and 006ba1d.

📒 Files selected for processing (7)

• src/frontend/dbusfrontend/dbusfrontend.cpp
• src/lib/fcitx/inputpanel.cpp
• src/lib/fcitx/inputpanel.h
• src/lib/fcitx/instance.cpp
• src/server/main.cpp
• src/ui/classic/inputwindow.cpp
• src/ui/kimpanel/kimpanel.cpp